Malicious PDF — malware analysis report

Static analysis result for SHA-256 075484815e57a989…

MALICIOUS

PDF

82.4 KB Created: 2021-08-27 19:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1391265f2c686c41ea8b0a83ed45f978 SHA-1: 5421bac067781df0adc2a08458f42c1eb42598f8 SHA-256: 075484815e57a9895f9a9f17948dd6d95aeb7797e0e1afd3ad741972f5c5874a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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.
  • 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://bukharaatlanta.com/sites/default/files/file/57802538075.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160961923082d0---91496682098.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/fosasifiroranifugunatazor.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/31488796751.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/gasexiwud.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/51178899308.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/81697093409.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5o7ag8vhffb4hmbrqn6eo5vvn1/jukujamakitevi.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/16269416951.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/lokisizitajerixalububoro.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/kuwupupubonalebizo.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3c331e056d6a48c3a97e4589bf3d1579/34750828903.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4bbabbaeed6bc8a11f154695327d2fab/gakedonoleluxunupo.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/42348711232.pdfIn PDF document text
    • https://egf.tw/test2/images/file/zedejotodogi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae3fcbb9c---44199476064.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607965a1b1548---11786210033.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/86954968449.pdfIn PDF document text
    • http://inncredel.com/uploads/46387438914.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2ea367cef---foniwonozagefavefovawe.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/zejepalowolerixadi.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/34267476505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=engineering+mechanics+dynamics+12th+edition+hibbeler+solutions+manualPDF 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_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 17940 bytes
SHA-256: a90c4b61e3d8535fbcbb1b07055dae29fede1abc5351ed41fe1329e1e1e9dd64
font_01_sfnt_off00010965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10965 11328 bytes
SHA-256: b956d44531abc8049f9bc6c7f4b4ff51d46a7051b65d1f68dc4b5009456d05f7
font_02_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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