Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8844b54cf7ade71…

MALICIOUS

PDF

69.4 KB Created: 2021-09-10 13:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2809747d64f10007a6b7a3a3c501bb9a SHA-1: 99b58d39be35c833101cd9fc82618f0554b29bf0 SHA-256: f8844b54cf7ade717f91380c568bb377b19c356a2c6678b9e5ab617f9a9fbef8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are likely compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of these link farms and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jl-vacuum.com/upload/files/9590024252.pdf In PDF document text
    • http://arebiatours.com/uploads/files/vixolale.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369cf65ac58---vudugakok.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/zudajasetusakorufaxi.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/29578010832.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ca1d4a518440a02eb1567a803b7645b3/8127122396.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/demaposijenidelobabuf.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/ruwewarimuwugivizomapugo.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/77919155416.pdfIn PDF document text
    • https://labelmarket.pl/data/file/48760668839.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/barogipisuxekujexa.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/xevoxiga.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-9/20210909185935206508.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/badefesebikodu.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/1796657789.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fdbfg52vr6osfb8k4rmuailoqf/vabaritusazetima.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/22579147574.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/sujimotesuvipivope.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/gubiwelanas.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/32b027359fc89a34bddf9f57758bcca9/gezavonigiziregowaza.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/62045576929.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f71dde87---suximorigagarum.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/38667811293.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/30815033596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+xbox+live+gold+no+surveysPDF 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_off0000b240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 10660 bytes
SHA-256: ee64553fbcd39ca5e2a5634a97959ac43d87a96566f5fa11f175b12c9c75d296
font_02_sfnt_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 14956 bytes
SHA-256: 3a87cdc3ce955fb636d36bf782d21489c2f351d125d392d2b0f4ab5ad7d7f5c8