Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0305d5827ca2d04…

MALICIOUS

PDF

90.4 KB Created: 2021-07-03 01:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e41135e384c0af4d0e51f4d99b5bd481 SHA-1: 01cbea6057c4445059deb0dfe524cab9ff86eee6 SHA-256: a0305d5827ca2d0441f9c4dc0e38628308f2c6ccf974eaf4a4ce19657c06e334
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to external sites. The presence of numerous unknown URLs reinforces the suspicion of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d061bcf37---12208470322.pdf In PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/8859d14d91a1970ffe2653b222bdcef2/18235375539.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/46878812253.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/mowugikumaxeziwaz.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/m052r959dkceccmqvleku3lbjm/fixenifi.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/vogetusalujiwetag.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8e2dc4e78bca04d7a59141da13fd140f/66576878707.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/43552426260.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/hdqna3g8ee686tnv5mfg0tlkqp/19915265398.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/cbf929193b9eff1ef17a4c54a7f227d7/likotejarisezinib.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/99297427427.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/5515289121.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801f85ef963---89191111102.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ivmlvsgd4bip4pgl3r1lof4t6h/36507773303.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c466a523ae116eb0dfb1f980400d167f/88981628571.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/d0af8285c62d4ba83374a022cd3774d0/88688251866.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b12c2e59c3ff203bbc6ae6c68624bfca/bowidugaredutegen.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16084a98242b63---50142247815.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/70086010314.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/jovoviginurunubemake.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a996f4a64af---ritefidozuporujozavigoro.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b6ab03f74---sofawimuruxabusedoje.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2c7d66f3---lonawusagopujexugur.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/gn85kputljm6nqikb1a9tgndt0/lanuzivibubasel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=a+type+of+alcohol+found+in+alcoholic+drinksPDF 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_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11354 17948 bytes
SHA-256: 007df0cdd15d2b08ce47a192aaa2d59e16bd0ed8f1e59c071fa9e75b0dbedf59
font_02_sfnt_off00014273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14273 11004 bytes
SHA-256: ff8c8c5219163ec94d90f3d1f95cd8403f4a18d7251a2e7651f288cdb6be0fe2

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