Malicious PDF — malware analysis report

Static analysis result for SHA-256 40478427fdcd542a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 11:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e4d7159cc5c4ef037aa8984df5f4149 SHA-1: 5fa64c7e54ad3be553212143ec7f5489b512e6e8 SHA-256: 40478427fdcd542a7e705fad82dff7f6dbdd08b004e9d9ebf9afa3080097a9e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for various support-related issues. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to direct users to malicious sites or engage them in a social engineering scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdff516785---52273817451.pdf In PDF document text
    • https://dycmc.com/DATA/upload/files/202109100705448476.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/lizufadisimovekax.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/39651690285.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/11665328084.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/99153188434.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/nolojurezedonot.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/56808072760.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/suxifutunogajizuwuba.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e23e58cc0---94216629936.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/3924129607.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/toxiwofaluzud.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219101834329602.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613324397f180---17633532031.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/17016459923.pdfIn PDF document text
    • https://onlinendttraining.com/files/56539749129.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/fazunorozufomufajigoja.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/jasofobuduwuwaziv.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/32261253488.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/fukogetarapuvebuzelagim.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/xodotibomodowogugigikokof.pdfIn PDF document text
    • http://belean.pl/userfiles/file/16255891465.pdfIn PDF document text
    • http://modero.vn/upload/files/pasubejirat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=imo+mod+apk+unlimited+diamond+2020PDF 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_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 17492 bytes
SHA-256: 2592fe5bac613ec277e93d48dad72b8452f2cffc3f44838b9cbda4c55a87586e
font_02_sfnt_off00011fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 10668 bytes
SHA-256: 500ba9c45213981f06112ac9afd47cef7876508dbd607accde931ece5ef92d82

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