Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c331aa9f878eade…

MALICIOUS

PDF

85.7 KB Created: 2021-09-08 10:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3966ffa33f307c989d591c394133249 SHA-1: 1ed68bf2f0b3099b1279a8f9d55c2d528bd6b02e SHA-256: 8c331aa9f878eadea261c4858c6a37e597479a4af1125f4b226dd42f2eed1682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://homeopathyhongkong.org/files/fafutidegiwutafege.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94febfe50---dibipewinanexod.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/13398242175.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/17165538075.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1813b16cc---97963294547.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/xozumaxutivodibufonanazav.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/716fac92ad1bf6772087779dd89f2f50/xovuzotol.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/wofuw.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1684d09e31af2ce2a141a4bbff1e1a0b/zavapazubaforogitama.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3919083ac---lowunojomomakago.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/pi78dkdjfoo89g62748rhtjc37/limanekozotititeduluwug.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/19eb65c9556e2ea68e5b11959bfed7fb/zosunaxoriwezefu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac75205cc0b---xazosusuvegubarutewif.pdfIn PDF document text
    • http://mesterek.net/tmp/luruvafenovovan.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/11c0574ad0301a7cf588357b325145a6/60234092128.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210705_5421FDAE07D3CA47.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/mijizerekevobiwolawum.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/nukimonosowimub.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/60836710863.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/dupovotaxobazusi.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/ponix.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b5078ac26022f57c0547d126cd042f2c/vozupoded.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/19efcdb54cb135937f93e69126086522/73455456581.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/zoruvesazebititaruvozaki.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706915466c8---82611259874.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/7660931818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=python+programming+an+introduction+to+computer+science+3rd+pdf+downloadPDF 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_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 17656 bytes
SHA-256: 5cac4ffc23c993331e9f48059ee541a80a514106a07d85a2e0aee591e4b93aa6
font_01_sfnt_off00011512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 11540 bytes
SHA-256: 8dcdec3d5b0ec23b3e88d9c474e151b68d60bfe2f476d4ede0ece6d973710a7a

Open this report in the interactive analyzer, or submit your own file for analysis.