Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d035f92f4b842f…

MALICIOUS

PDF

82.4 KB Created: 2021-07-02 03:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b27bcbf0c70a75aee9b125406a37bec6 SHA-1: 3ee67a012dd99adb5787bc6da77b7a772620aadc SHA-256: 71d035f92f4b842f5f6610289b0d3ac302c25eb0a0cb1476427757955cfa54c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The document body is unreadable, but the presence of multiple links to potentially compromised CMS uploads suggests a tactic to distribute further malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd06e7d10---45425124886.pdf In PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/bupokamowu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082642fe2336---6934522038.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16078173413fa5---94730776912.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/77db46dae54213133b8610cf40362925/95827925911.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/bevovixizexalikefuzozerek.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/sadamiwemetowefuxufovej.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1fad4b039de177651c37620fa1ab3731/183988352.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/dixitisutujun.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/79020082357.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/77772326808.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849c165f9e8---56344460006.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/05f7b573b41a91249f9643f07184862b/pumezopaxiruferikitarux.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/85325142514.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/487042b0ab0c2d5d3c0c2af13f6b7f88/56985284180.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/83087204478.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/66168405467.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a467fb9f78a---dedex.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/rubalusupovaz.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fca7f99772---32510291329.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875543ef47---21564609196.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff95772088---bipetanepomug.pdfIn PDF document text
    • https://birotex.rs/images/files/mojawezusekolotetepix.pdfIn PDF document text
    • https://ahha.az/userfiles/file/mipadakizaj.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/3620836218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=spoken+english+vocabulary+with+bangla+meaning+pdfPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000d702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 11740 bytes
SHA-256: 560a10e69cdd25f6222c539f38fa9dff43e8670174d55e81297b81209b677e13
font_02_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 18364 bytes
SHA-256: 74155aa93334b87e92332d4a53809faa7c80937e572e649666b8a2c638f6eba1