Malicious PDF — malware analysis report

Static analysis result for SHA-256 67913ad4d9206647…

MALICIOUS

PDF

86.9 KB Created: 2021-07-18 20:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 90a0bc7c46ee306c502e36c65719114a SHA-1: adf6feab33107fdfd1709d7c193faf29a11275d4 SHA-256: 67913ad4d9206647a59de04de0a53ab94414d64af1705376757e422db9013f10
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites. Some of these URLs are hosted on compromised CMS upload directories or disposable hosting, increasing the likelihood of malicious intent such as phishing or malware delivery.

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 https://alakharia.com/public_html/userfiles/file/tegivimuzizoparanow.pdf In PDF document text
    • http://www.vegagastro.pl/upload/file/67877749543.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/borixiv.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16209425972131446371.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/56931339741.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/zebirime.pdfIn PDF document text
    • http://abc-tel.ru/data/File/jifovawiwawime.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vcmhg8s3eiseinaogf5aki3483/rumuget.pdfIn PDF document text
    • https://tavio.ru/files/file/90032717044.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/ee4edf711f9e59d73507de72f25cbdf1/duvuxivopixun.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7ed528115aebdda8fa38220f79322d99/kujuxe.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/1hforeqrdo8nebr4vd21tq11k5/mozanitodabenibafexox.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce085b1bf---nirinameridepuxilimesotu.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jesolekajakupero.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210608223000.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/27679686089.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b10e924fa412f285a929ced5dd94e8dd/nunisoda.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/rasam.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bd0c724a763c61a37850ecec8e6d011f/dalupotineg.pdfIn PDF document text
    • https://bak.vn/upload/files/75721684456.pdfIn PDF document text
    • https://777mto.com/contents//files/kamobal.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/109e2607f8e21527af107bdd01aa85dd/nozigabowurekezodow.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/gufojowitovilabip.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767f15500fe---63520830105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sentence+of+mistakePDF 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_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 10520 bytes
SHA-256: a834f1233a0af54bcd9b445121d7affec5ed0b06ec99af55e15e644ec085976d
font_01_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12359 16628 bytes
SHA-256: 18a156263ed424bef072142a93f18eadd9a95975190b85728a0b233bb4975b1b

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