PDF malware analysis — malicious · 864f7b43a150ac6e

MALICIOUS

PDF

82.3 KB Created: 2021-07-21 00:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: e071b8f9a663070b3ea6e5bb6d44b198 SHA-1: 1077c433d3bfbea7e52d1419570bfd46615a52ba SHA-256: 864f7b43a150ac6ec2ea4cc37e26a96314df132de4f3c1da88665664c8990697

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely intended to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 6

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.
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://hkbca.org/UploadFiles/file/20210702053338109.pdf In PDF document text
- https://people11people.com/uploads/File/mediwixajajomekibibitixu.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/05c59415e5386720456bcc4fb558e9ae/90244161591.pdfIn PDF document text
- http://animationcoach.com/userfiles/file/49601751285.pdfIn PDF document text
- https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ec62226349932641592f1520fac8c9b6/novelawilikajib.pdfIn PDF document text
- http://happyhanool.com/ckupload/files/tumiforapuwi.pdfIn PDF document text
- http://metafelix.it/userfiles/files/mitomokogur.pdfIn PDF document text
- http://softwarefactory.nl/images/file/dixon.pdfIn PDF document text
- https://www.truck-transport.com/ckfinder/userfiles/files/joxigaremizufag.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe307c36b5---lekupomeximakewoxemubaza.pdfIn PDF document text
- http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/84088361352.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b1b7813f1d06b8d5b4c3768561e60e71/tivuzej.pdfIn PDF document text
- http://papaicountrylodge-longstay.com/user_img/files/linutevefuwikarogemuta.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5d4c8a72---gebabageboleropeluzurib.pdfIn PDF document text
- https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a780fc4554b2605934515bf511f07d9f/57592938086.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085f57373ece---zikulusajevaxilujubasit.pdfIn PDF document text
- http://a-kamen.com/userfiles/file/vuzuxotowonafo.pdfIn PDF document text
- https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/5781c3de64ce3c69d90f924c4ffcfeed/rakaritatolewe.pdfIn PDF document text
- http://cs-golfclub.com/ckupload/files/50013989508.pdfIn PDF document text
- http://tktravel.shop/FileData/ckfinder/files/20210610_C395F146F1880E1D.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ea30e0164---sadororisovudo.pdfIn PDF document text
- http://tischlerei-schlusche.de/sites/default/files/file/30817902549.pdfIn PDF document text
- http://kutyasturak.hu/images/files/20240432420.pdfIn PDF document text
- https://novahealthclinic.ca/userfiles/file/rokutibinomufelizex.pdfIn PDF document text
- https://akita-inu.lv/www/files/files/47998762419.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/fb3ef518b995af3c36844f524ccb0bee/23576443220.pdfIn PDF document text
- https://hotellemaritime.com/hotel/upload/files/kokimamijuxewiwo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+remove+bookmarks+from+pdf+documentPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dbd9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBD9	17608 bytes
SHA-256: `40ad685b1c266e0c9d323f0ab7aac47d1b6e12d4520bd7c0ea51de2091f3e64c`
`font_01_sfnt_off0001098e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1098E	11120 bytes
SHA-256: `205c73f30acceeeb957a25a30dedb0112db10d944453c8fd6832e3ca92959ae2`
`font_02_sfnt_off0001235d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1235D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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