Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ca1a2fe26b2034…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 13:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a7b15bdef7e26fb431599b5262d956c SHA-1: 5a3e0b2c9ce3cc16f9c8e9e040115359764717ed SHA-256: d6ca1a2fe26b2034f869ab7e02b413dd5a77166a774322ffedbd81b7fc57c646
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.001 Malicious Link

The sample is a PDF document containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Heuristics indicate it is a link farm pointing to compromised WordPress uploads and disposable hosting, consistent with phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic specifically flags the document's intent to trick users into calling a phone number, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mmdplus.com/userfiles/files/20210908_163556.pdf In PDF document text
    • https://smsenerji.com/resimler/files/xowijimutagin.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/56734964607.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/19744756466.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/64919516821.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/40334206857.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/titasag.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/80925588589.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/nasewosaleki.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/p42jm0j1i6913fecmagpbhf8g2/61800299950.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee34f418ce---tajuzopizubog.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/66079495918.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/10349736933.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/totavo.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/fawozuziret.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/vojubevawaxerikedudo.pdfIn PDF document text
    • http://sushibelovo.ru/files/8973877306.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/mopudoniwifozirin.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/kubije.pdfIn PDF document text
    • https://krossi.ru/images/content/files/sitomitojipumodekidabonid.pdfIn PDF document text
    • https://rajaunited.com/contents/files/pokuvip.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/07b07a515c60c4e8a9361224c3ebec62/xuwoxof.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109031401553225.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/kibitapepuvodudezaditu.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/12359682016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=turn+old+phone+into+security+camera+without+internetPDF 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_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 11044 bytes
SHA-256: 825c4dc72dd83cb7be0a5496f58b58968e585d2c49a9fc36f707ef5e11711003
font_02_sfnt_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 18264 bytes
SHA-256: 7065ff63eb868bb2674284746722684cc6fb509e924bcdff2964049b65f857a2

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