Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bcc7a2d44a9e51…

MALICIOUS

PDF

89.4 KB Created: 2021-07-30 00:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96e5f3f22ccdb52c2306634acd07d906 SHA-1: 319aeb09869ffb01cfc790f2dae2c1923ab16dfd SHA-256: d7bcc7a2d44a9e518b325e52545e80f26e0a133269ba4388bc245ce66fe4aac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm with numerous URLs pointing to compromised CMS uploads, indicating a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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 https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/0fe758931a598e5eb24de9a8192ba41a/vitavexezopetupe.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88a5ea986---doselamamu.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/juwopegimabaxiwef.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/22485702306.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/7ca8fa26816d65c6624be2fee2e04438/gipupuwilarojonenesewub.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/56546079635.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c7b9605d---55560184899.pdfIn PDF document text
    • http://mousike.it/img_ins/files/80669527348.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/12018183393.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/482431c72a78b31c7dd84ee474d44a3f/11873173893.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/pisubet.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4c2532aafef6d632ebda3d02e238c7f3/20385474314.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8390a446e5---25295024135.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/53417873598.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/tikebigadi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/554fd472bf080d42569afa043773f417/tewapigobuvonategavi.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/wumonuwizoxepevepagix.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/datitexa.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021060933218_989475101.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/suvadoz.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gt121nj1nmskgn9t16r0rmgar5/93156885255.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/30873501874.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/24049370106.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/fjc49af37tjbc2eh9fmhofrek2/bozapijokubelonigaposekod.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sikatera.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/141eeg2sk1g74u6nfeov9anmdp/bobel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=clarinet+exercises+for+beginners+pdfPDF 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_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 16416 bytes
SHA-256: 5baea3a3c5e290e4c082e64759e978a051453e0f097e0552ea56e8c065ae8a5b
font_01_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B51 11068 bytes
SHA-256: 056c0f42989e5cec3796bd9ca643a75b5dc95e8a020bcee0fdf7f6dcfa4fb161

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