Malicious PDF — malware analysis report

Static analysis result for SHA-256 822ff945dec9ea1f…

MALICIOUS

PDF

95.3 KB Created: 2021-07-05 13:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d17b27873bd7acc230fbdefe6f0941c3 SHA-1: bab89d16c4d2b2740172f1f822d18c2fdc3b8daa SHA-256: 822ff945dec9ea1f0d8d2b086210255564c1dd10e9d12030cb7ab2c1bf5ee1e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting further PDF files, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/97ea7179936ca3d0d7b62849ddd55bdb/ximelut.pdf In PDF document text
    • https://istocdukkan.com/userfiles/files/vawaluzu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf4b44168---tirexi.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3edc0e86---218177166.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/g35r2a39jueff53hfl7f1ojrfu/domugezunozu.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/jobagegonukabuj.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/retefe.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/livamajisukirelusisizal.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/2e24f8d3c75026d5971c0f1012a64b4a/71642685496.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/9d57608adf02aa03d608f5ecfd5db2df/2524448661.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4116fb5283---gopotutajofizufagiboz.pdfIn PDF document text
    • https://webmenuplus.com/images/file/16471372434.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/32142114910.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0e15e175---kebexalirusine.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d92255af75e---98222905208.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1445026cc4a6e419cc10b69b3b0589c1/xanamoju.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/takivexarijupepudodureduv.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada873f36d---pifemoboturemusewotekuvak.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/3975b29536a5637bf44cc2a6e0013050/ziwitenekinisavivoduri.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3cf2726869746ef508698d5e1c31a894/zivexofizetubi.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab8d1f8f5---53204586593.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/jijexu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745e87c24bc---46616900809.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/sabugumalorolewof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nothing+is+true+everything+is+permitted+assassin%27s+creedPDF 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_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 17400 bytes
SHA-256: f36c5778cd418dd68619f0d0c0d6cdd389022f203903506d44d63be11f424249
font_01_sfnt_off00013bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAD 11204 bytes
SHA-256: b98a0c8ccc00277e7e6ed0e09203d3308b53ba0209c6d239fb8b67d67ef17c8f
font_02_sfnt_off000155ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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