Malicious PDF — malware analysis report

Static analysis result for SHA-256 623e777458d874d9…

MALICIOUS

PDF

96.2 KB Created: 2021-07-01 19:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fea6ac539bca125fb89f37b778244353 SHA-1: bcdc73ee30b6a54c3a9096f516f6b895db1e7960 SHA-256: 623e777458d874d9fa45b56025988c2c8ae7a6aa861004e0117a89b3e91f9de0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF is designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nenanhduong.vn/Upload/files/88726512060.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e25f3d598---mozuvumilidaleg.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/gchpgeb4mjsd7ik9o1628735um/fulok.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/pabap.pdfIn PDF document text
    • http://myredm.ru/uploads/file/dibotulifeme.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb2974556---geripaxubegoses.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0d57821d---bemokarobubedit.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fc709a55a5578950740d513ba47fcecb/4312819830.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/991d3e4fa3ee6a1b4c5136c6b6b6abaa/moxaborawivufinepa.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75aaa8c142---lawimogosesizakulo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/96962887985.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/lawewuki.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/jixanofivowanurebe.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/nesetuzimufale.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/84899559024.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vig2u19g6se1hkpg81o4nu2gc6/37993105135.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a96bb976d33d7bf2864546916b2141f1/93139285109.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607408cfa1fa4---wesekovemosavexigabudaju.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/53091101364.pdfIn PDF document text
    • https://mollis.rs//files/22088576746.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d032107556---6443051695.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/dusu10og0bd8iadou5hgr6e953/fekuribobokevuliguw.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/dbddc83cee7d1252df615755d6e8106c/61096217286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ark+the+island+story+guidePDF 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_off0001145a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 17644 bytes
SHA-256: f7fd1748a9e711371d16677fe8bfb03e0b72f3bfc3e0d45fb2723982a821c22d
font_02_sfnt_off00015ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE1 10816 bytes
SHA-256: abe7b7eaa24306feeebdb217fab6c420c6a14756e041dc9f0b18fd653c7ef105

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