Malicious PDF — malware analysis report

Static analysis result for SHA-256 345e53615cd7ae08…

MALICIOUS

PDF

83.8 KB Created: 2021-10-08 15:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2c9391c710817a830647dcd379811332 SHA-1: a5b67bd35be887d333ec57d9513163e8c1eca71a SHA-256: 345e53615cd7ae08834bc7f5314aace1f9f50bf3f87a712139f19cf02dac5676
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to potentially compromised or disposable hosting sites, indicating a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the user is prompted to call a number. While no scripts were explicitly extracted, the presence of numerous external URLs and the ML classification point towards malicious intent, likely to redirect users to malicious content or initiate a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ecoolteh.eu/galeria/file/depebajog.pdf In PDF document text
    • http://srub-servis.ru/userfiles/file/rumitulaj.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/43094045044.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/vemelenope.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/69260036588.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bejc0naa8hl0ocn17fpdc1qkl2/51429530385.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/mejejaworunasusepodujo.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/23794318500.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/pesofefobikorej.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/20958765709.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/wenalekoguvevifewosi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/efp19f56cm1lblkecvd2n4h47u/78064869341.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/76005544078.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/banalujuzubikitulipepular.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/3864994022.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/71425428140.pdfIn PDF document text
    • http://builderall.info/userfiles/file/lurirofom.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/latixewojixumigoxobatuj.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/74319042641.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d735b8e7c8---jawiwesakexolu.pdfIn PDF document text
    • http://santehnika34.ru/images/file/tilamemumatemunonerodutaf.pdfIn PDF document text
    • https://oldgradeducation.com/ckfinder/userfiles/files/33265463196.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/98717940071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+small+pdf+filePDF 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_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 17940 bytes
SHA-256: dfbdd16195272305a79ad5e3a640324c8f86527bd24e2b23e202117510a80973
font_01_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 10532 bytes
SHA-256: 3cd21830ef18671cab47d94533a28d9312bfcea7f62a98baccf25738ad5ad75d

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