PDF malware analysis — malicious · a0c8039bacd28fff

MALICIOUS

PDF

88.2 KB Created: 2021-06-30 01:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 654d7325ccfbf1d1084a1a5ab89b685c SHA-1: 6b24be2f995276b61715c84d8d89048f17a7a997 SHA-256: a0c8039bacd28fff4eb7e3252783c4f39a73fbbfda051a5c49b242edde41dd5e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of 'utm_term' parameters in some URLs further supports a campaign-driven lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
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 https://philabc.ru/uplcv?utm_term=my+feet+fingers+are+itchy PDF link annotation
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2fb660b60e7e510ee0d114617480329a/nafapuvireradesejes.pdfIn PDF document text
- http://zahradysnapady.cz/soubory/files/9893922568.pdfIn PDF document text
- https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/6847abe3430dfc8ffb767d0421c7db93/kexakisemojilanuzewova.pdfIn PDF document text
- http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d85d0c7a---41020746128.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9469ed99bf---57765577955.pdfIn PDF document text
- https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09eddc6a87---nekusije.pdfIn PDF document text
- http://wallsfamilyreunion.com/clients/876683/File/bikovibamazilonufuto.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/29856c68f0cb11edbfd57742c3c3d2a5/59981784127.pdfIn PDF document text
- http://cukiernia-waltar.pl/qcms/userfiles/file/6915404794.pdfIn PDF document text
- http://exclusivelimoservice.com/ckfinder/userfiles/files/wepogabofopavudutexitufu.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/13428a2e6f5f194bc66651dfa58fcb78/xamemazolazapa.pdfIn PDF document text
- http://steakclubhn.com/campannas/file/nepit.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f96e17c6---lusoz.pdfIn PDF document text
- https://hasekei.jp/userfiles/file/xotituwozitibuzadubozo.pdfIn PDF document text
- http://hbleg.com/admin/userfiles/files/fomimu.pdfIn PDF document text
- http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/76833141783.pdfIn PDF document text
- https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/556581d6f0a3a42267b06437f37e0879/tikel.pdfIn PDF document text
- http://tks-forever.com/upload/2021/06/20/file/befilali.pdfIn PDF document text
- https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6e77a466bd3ecff5583624492b376e81/21361011088.pdfIn PDF document text
- http://28777886.com/Lpf/UPFILE/userfiles/files/lefowe.pdfIn PDF document text
- http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea8907634b---7626253373.pdfIn PDF document text
- https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f8089a01b93cb1f061116fb3c6d2513b/xaworub.pdfIn PDF document text
- https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/b7d2cslsg5et3q75h2tdu1mun2/zokibefetowemojasifavex.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b9cee008---kokabuk.pdfIn PDF document text
- 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f88b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF88B	16544 bytes
SHA-256: `52cea22f3e3610ebc98f301c5c8703bc26df3e81b2686acd4e19cacd00f9cf04`
`font_01_sfnt_off00012369.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12369	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013b80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B80	10556 bytes
SHA-256: `d63a43b930e6d5be681c565b843f43975d51ab5034ff9579f882b93f398bc655`

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