PDF malware analysis — malicious · 84142c5caf50efec

MALICIOUS

PDF

113.5 KB Created: 2021-06-25 22:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: ca16890d1b5aa683f4315f1e3fb63467 SHA-1: e8b766712856b4c40fbd7e74bc551a8d7fc9c99e SHA-256: 84142c5caf50efecffd47175b4abc6dc8cc880b3d3f71d24c9e1a7c1083099f3

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate this JavaScript likely redirects to external URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9279

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://maekalocal.com/Maeka/UserFiles/File/jawojidew.pdf In PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790c2f0cc9f---81174204122.pdfIn PDF document text
- http://fujavietnam.com/images/Download/suwet.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56fbee85d5---vufulatikak.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/c1pg8ubg89p1mdh3orjt5glk5d/vedoki.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/03a61844060261410561eef377441d84/kajesosavapuseb.pdfIn PDF document text
- http://www.irrv.org/uploads/files/25308333379.pdfIn PDF document text
- https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96e99d0a9---70754265740.pdfIn PDF document text
- https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/598cue19icpourdmu69enqrcdc/81599765579.pdfIn PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ca002f225906d15417f8fa65f77fa4a7/famiv.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074089eadb03---midosuluseromabis.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1jta70iussvfbe232dt3n80jf1/70900905493.pdfIn PDF document text
- https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1635774f05---70883650112.pdfIn PDF document text
- https://tahubunting1.com/contents//files/46429734362.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07babec483---zizomusudanikitudagamin.pdfIn PDF document text
- https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608513a17f28d---62538047288.pdfIn PDF document text
- https://rijst.nu/userfiles/file/niniberazukagikewew.pdfIn PDF document text
- http://sincaremedicaltour.com/js/upload/puvadegunedotofoj.pdfIn PDF document text
- https://iamtimeshare.com/userfiles/file/86944107261.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6a9e60b08e206d333b17eec3d0f2cc0a/77439604157.pdfIn PDF document text
- https://theelementrama9.com/userfiles/files/bekuvavilinifuxilafinoje.pdfIn PDF document text
- https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/81c4f527864dd841748ce8d44c67a79a/45874951488.pdfIn PDF document text
- http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d369756cdc---92301263536.pdfIn PDF document text
- https://fleschimmo.lu/userfiles/files/70490687900.pdfIn PDF document text
- https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/6nb4q4d2lc957aj2ven1nfe71s/bemidulabukuwadimovixit.pdfIn PDF document text
- http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a76e4c00---94003086537.pdfIn PDF document text
- https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a41945f1efe---dikewuwolu.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+meaning+of+gulfPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00010158.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x10158	23524 bytes
SHA-256: `d316bc76283195f236f2a27905c73a7698dc797fddefa55c63412f888a6b8792`
`font_01_sfnt_off00012d01.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D01	29928 bytes
SHA-256: `acac38e6d0d8b35b73f55cf41a7e741c484eb0010098b9507fd827e0c438ab59`
`font_02_sfnt_off0001767c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1767C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00018e93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18E93	10360 bytes
SHA-256: `8407842f3d120f0c39db16cd048b952491176a17fda921955adbeacc962c5046`
`font_04_sfnt_off0001a5b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A5B3	4232 bytes
SHA-256: `f73133583564b217b0d36fa49871343d3c8e47adbf6d85f82be9287ab569029f`

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