Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cd842b2938f877…

MALICIOUS

PDF

76.6 KB Created: 2021-09-22 11:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d38b3c2c3ba53f09fb52fcc02c5667c3 SHA-1: 367557d4f8d58504775da68965694d4210e43320 SHA-256: 22cd842b2938f8777e6665d7d6d77f8b39af160fc9242ed915bfd813fcb6da5e
176 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to disposable hosting and compromised CMS uploads, suggesting a link farm designed to distribute malicious content or facilitate phishing. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or scam pretext, likely aiming to trick users into downloading further malicious payloads or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://myphamso1.net/uploads/files/33596423243.pdf In PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2a60b077---36187687235.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1728daa60---pefekagebubifosijibi.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/getetagipujev.pdfIn PDF document text
    • http://sjanzee.nl/file/lorizupisek.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/barurokegokatapedev.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/92732371301.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/giputarat.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/46589108524.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///bonudajisi.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/68823251338.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/surikananeluj.pdfIn PDF document text
    • http://findusafranchise.com/files/files/wuxiguxanegiga.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/tazuridosafebidiguk.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca1a7ba0e9---xanisijozuwe.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/7630585304.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8c1fa9df7034517eeffadbdd4c0571cf/69902296758.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/morimumesegalelipo.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/58527984725.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/fugujerigix.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/maxukemebagininulepagas.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/zogifawegibeti.pdfIn PDF document text
    • http://tid.vn/upload/files/12965828489.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/sakagawelinew.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/jezipijadavumefosemokuso.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/45601462742.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/sekatawofatonigoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mejor+lector+codigo+qr+androidPDF 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_off0000c86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE082 10648 bytes
SHA-256: 113fa13a3e13df12dbf8a35efb64cf8d2d339e5afb62fe1c3011e84c4631b4c6
font_02_sfnt_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 17436 bytes
SHA-256: 923ea35ece19499e741cb51bd9bf023c9ab0f5f5023047a561fa4ea5cede3c2c

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