Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91a22fda40a35c3…

MALICIOUS

PDF

99.5 KB Created: 2021-07-24 00:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1937b28fa8f6c64fe4f48ad57d8e3454 SHA-1: 9a2ea2a4247cc97928531eda1f257a97cc4eb5dd SHA-256: a91a22fda40a35c367b0b9a681718b693599b7a98f0b0584b069cf0cb5ebfa56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous disposable domains, likely intended to distribute malware or facilitate phishing. Although no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/12683366491.pdf In PDF document text
    • http://myucmas.com/userfiles/file/tavidosowuro.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/q62b8kt0f1j8v7dhifaabet7e3/48248466510.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/80507403085.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be096d950---85782829570.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-13/20210613092906333419.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/cttqsj0ft2t6jouahkef8tug9l/fedole.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/remebuzapimarujovabelot.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/61382160034.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b3a1b3f91---lozis.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/88151515785.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/xagufut.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6aa3c7cf3a---31868744319.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/57133356350.pdfIn PDF document text
    • http://ombs.ru/uploads/files/13152145253.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/61759835458.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d64498feb---zenotikinarodiwukanubav.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8561c6b0---pibonadojuluwovomurix.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160894c84e6725---45383995174.pdfIn PDF document text
    • https://coil.hk/upload/files/fasosozagivifobevuwusifuf.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/xonuzageruj.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ffdd63c42---50646381199.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/7n487q8amob9fl7bufakj9ld12/58713077976.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ako2v699mhte8mtfgp6sstjt1s/bokozajilof.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/5710269709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=command+switch+cisco+catalyst+2960-x+seriesPDF 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_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001308c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308C 18636 bytes
SHA-256: 261aa87163657ecdaa4caf984d1aa3a1753045a26fbf068acb2e954fba426782
font_02_sfnt_off00016281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16281 11580 bytes
SHA-256: f397272774791bac0dad01b60cd5200aa7966cea5acdba4feca9b762c616eb2e

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