Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fc374e9d733ef7…

MALICIOUS

PDF

96.7 KB Created: 2021-07-03 17:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: db8dda2658817d1d8970050597a15a53 SHA-1: c80bb495ffffe2198b7f7b6609e7b92b06ececbd SHA-256: 11fc374e9d733ef7de0b018bd7afbed81440590d93b210bd2d7f8d78b17e9088
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9486

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://queure.ru/uplcv?utm_term=contact+backup+apk+download PDF link annotation
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/q3u4ub34j4r3tf7v4t6crtb264/gotakowibeke.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/semevudirapanekuratovu.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/59819651413.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be24a3adcaa---mipobividulenozekije.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/97252931631.pdfIn PDF document text
    • http://mega.kz/media/upload/files/gumilasowami.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/0d85aff0edfbaddc37b6f09b9b838fb0/jikixejozito.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/kadupiwijegubotufodo.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb96b6f658---wamajitewetibasowiked.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/22575480851.pdfIn PDF document text
    • https://mfdesign.hu/files/file/getuf.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/e2phhkpa56pjja6b2ts5363bsc/zujoramedisoka.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078cbce7f6b8---wevalanaj.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa958c94d---mujep.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/88930771084.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/witokeginubigoxugobujab.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/15874153182.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/90219132036.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/99270412190.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/35308587988.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/daf462dbf5480543f0a07733145fc71f/34266439029.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/xewujirebobi.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/tht022j1v2v3qnp8q93bjr3f56/jagisusexotunepenepoxaga.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/39900561755.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/losevinogumipepo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f8756d240c307bcd076704218aa7b573/2824007744.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 20024 bytes
SHA-256: 089a16e994f58cd5a7c86c94c8f8200ed2e46e756bd05e4ba1ec8f3b582c442a
font_01_sfnt_off00012094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A5 17276 bytes
SHA-256: cf44a29dc5e72a59872d60fa95fd7cbde0e7a5672a279734c3b8ba22b4831a05
font_03_sfnt_off00015292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15292 10464 bytes
SHA-256: d3fd32a069a78f76283c160421ec7e39977f418174dc574b562190a86a32959b
font_04_sfnt_off00016a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A58 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e

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