Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2033f31e7472ee2…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 19:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e2c6473edf8021d4e0e912ce0ff549c4 SHA-1: 4f5db00e5bc7ec8a368d5ea5784c0b4a34b5fb19 SHA-256: a2033f31e7472ee2a1e3125277c24b256e19a558a21a8fa6c6fda03910528849
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b35e35caf---rikamikesedegezazaka.pdf In PDF document text
    • http://fitviewer.biz/files/file/33188249874.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076c2cb4571c---xodovo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3p0f7a4gc7mlhg7afdq97s0o3m/91623011029.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889fb023e8a---waver.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/uigcjfghgqb4eu9pds87hrhpc5/fuxidilaboxegagilusedep.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99ab37c54---wiwederokajepepusalunafe.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/pigalilolirexidedo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/kifuxelekotigeni.pdfIn PDF document text
    • https://estoniapools.com/contents//files/96654263236.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/kotusofiriguwatuji.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/88a8a232a2ca2e528a3829ae6d61e3d2/38183953380.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3bc08ac0d6328f0411da19f8324e642b/38510871929.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d0a70b5a4---30939755415.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/votoronugoni.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/lalopixixulo.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/12209513275.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/df0442194f6bcc0d3d3d9ab8ccd949c1/gatirelesotunerigo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c21387a3dab---86288358522.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/c088728e740f1257823f258607580343/57599924991.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0ba869b22eeadaaaf22efe7b1ca1722a/memufesefazejaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=level+f+unit+8+choosing+the+right+wordPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 17392 bytes
SHA-256: 1b79dd9ff7041bd24d215a6892d555285e3cc81fe927ec050ad9a613cc78a463
font_01_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 11012 bytes
SHA-256: e336330f739af5fe1e5d5a182e80169487191f0335b8ec611a69fdc9fa349e48
font_02_sfnt_off000136d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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