Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1522af0a08f82dc…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 12:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d9bcee37e014bd20a133cae07efd1dae SHA-1: 0b5acc61385729a7fe44c1f76848e5679e360928 SHA-256: a1522af0a08f82dc199c28d6d1bd515973db4688a589b108d7480feef4914309
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. No scripts were extracted, but the presence of numerous external links and the nature of the heuristics point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://koparieshorvathbusz.hu/files/file/37348772962.pdf In PDF document text
    • http://zerosquareonline.com/file/zanunu.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/zamewononozerilekovedugeb.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161357ee0d96a2---11214320099.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/7sg8jn0fmlgsblnhc6gledbh3f/nagaxijopa.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/95232951715.pdfIn PDF document text
    • https://dyaa.club/uploads/file/97847474757.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/9537209441.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/delulopamuvasale.pdfIn PDF document text
    • https://laps.pl/userfiles/file/teteko.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/86137751508.pdfIn PDF document text
    • http://ciskmv.com/css/file/xuwesokukusepaxa.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/davexorebalobajujuxamaw.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/23455327337.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/tuvitejokipa.pdfIn PDF document text
    • https://kerryparsonsfoundation.org/media/file/23801128741.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/lenaxobokavi.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/bagorupowixutuliz.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312281297787.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/69940045436.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/4687997298.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3ba6c9c106dc7d928083f298462e38fe/benawedixesaduxomiwijamid.pdfIn PDF document text
    • https://emenu.hu/editor_up/mebezujesamufonok.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/78053572564.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/vixetobixevumuwogeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=too+much+optimismPDF 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_off0000b234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB234 14512 bytes
SHA-256: f24c9961bde3b5c7d712166f67cb39fdb6beb2c1518ebcea1572ee11db57244c
font_01_sfnt_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 10160 bytes
SHA-256: 55de5c76cc32c115fa0d815befb6e68af48f6cd722984dfa7c44af0f3d12cd60
font_02_sfnt_off0000ed2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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