Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d867e28825938e…

MALICIOUS

PDF

81.5 KB Created: 2021-06-30 11:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ddd5846eb9b13c0e04376c2875533470 SHA-1: 8377a80455fc4088479e67c78739e5926551f7a8 SHA-256: 19d867e28825938e23ef88dd7f9a577e321720af691abb8e3f3bf15ca17c66d6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic indicates the document likely uses a pretext of billing or refund issues to trick users into calling a number, a common tactic in callback phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://akademibt.com/resimler/files/60710344529.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a8214c2b897872e925b79d46048c2cb6/24411104968.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/55260670702.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/nerimuvutuketitifi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabc1461a1---95022360522.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061920500596.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22d9fbea8a---zomulorugedaralimu.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/riravudawudaw.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/45350135107.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/6046304866.pdfIn PDF document text
    • http://fxmeat.com/upload/file/170558f15aca817ff25cf45f69aeafe8.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608102d80a32b---sapurifukavologotav.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/7f0b7b4b92af12bca8f7ada22eb677ee/19364818965.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/71e04cdf9685b0c23aaa1d71b4526eb6/fenugavanufawid.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/rarabiso.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/53731441080.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a58e1694e---wefesepizetinolelulo.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/gopitutakovuwefigi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/nsu34ue9era01mp60u4hr8vkf4/33067327511.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160866955d2f00---fabivodapogojipa.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/80331151452.pdfIn PDF document text
    • https://datajournonepal.org/files/89751951526.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9c7d2252---70291234397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=livin+outside+the+lawPDF 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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 16720 bytes
SHA-256: 036750b3ac4e4d30fc69709c6fa3d35e4026b7827bc4cc452a711c07996e9e9d
font_01_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F6 10456 bytes
SHA-256: d18655915ca5a9296c6d46846970f6cd1a9d577ada06866957325843b7d6a08c

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