Malicious PDF — malware analysis report

Static analysis result for SHA-256 e562c3560b04c547…

MALICIOUS

PDF

74.9 KB Created: 2021-09-04 14:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66db3226dec793db97bed5d4328b8e83 SHA-1: afcfef4a729300d06bad04ae79b2e2a32dacc1e5 SHA-256: e562c3560b04c5476adde90ef0e5f7ae295e2badd303563a29a880a04029c33a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cuisinescartier.ca/upload/editor/file/kijetowilugemapevasutolim.pdf In PDF document text
    • http://centroolosprato.it/userfiles/files/xorezonakudovuli.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9b94b86fc---lixuli.pdfIn PDF document text
    • http://toonesk.com/upload/naragilisuwepijojov.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/wodikap.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/26854621397.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/87825307962.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210705014348.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/womorebevapukexepu.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/g6jr7fd1ngcp569h7shdha3eoo/42169095824.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/jurinadetadagonupozituno.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080b35e45f93---11008221073.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/da0cb36b38f82d4256fe2a75106d56b5/bakijerezovukibariragomo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703bf268f54---84223119699.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3b98f81fe73133eb882743b66ba0f930/jeveb.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/09697e14aa0977fd7b58c30ab4179fe3/66470961071.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/musot.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8e1d41b1---1427562900.pdfIn PDF document text
    • http://ebus.cn/up_file/file/kaburaregapopebererojede.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/49802100012.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a7d07ac73722365a6e51245ba32d138c/12417209464.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ip2i23s2imv9l91m30fqh4mqig/tixavurufufofazik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=elementary+set+theory+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_off0000bf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 10768 bytes
SHA-256: 885e2f6c409a8e34d26b5fe7d830a22f85b22a130f03d4ee107dd47cf3c587e2
font_01_sfnt_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 17636 bytes
SHA-256: 70e8bd306551e4c59bd1b9c9944936f0ad2a63ba94ca2ea002b1323bdaada201
font_02_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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