Malicious PDF — malware analysis report

Static analysis result for SHA-256 af900dd72e7d88a3…

MALICIOUS

PDF

92.3 KB Created: 2021-06-28 23:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 89e942b253d4067fe123812601ea361c SHA-1: f44c60cb74c94dc193a35b382df27afb33f5587c SHA-256: af900dd72e7d88a30b9f50e3b7d78b3a2a18ed19880e04864ef7f73707d294d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious link farms designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://archism.ru/uplcv?utm_term=chemical+equations+and+reactions+answers PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ab8b1e37---figekeviwujidiro.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47fd4a037f---pofobepopog.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/femekubepamosixatoviwe.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b54c150d---wirufojagipid.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/39331332181.pdfIn PDF document text
    • https://invest.pl/userfiles/file/55799543868.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe531455f---vixusepixiliniradin.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8b7c222675d079833bdef2ad8aca444c/99439335700.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/37740967003.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/vateradezavisabapa.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16076335a59645---xogip.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073abe9d188e---16904728369.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/dr6a272t5le2bcj19g964qh2cq/18835211632.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/begutirazudusumirisegajus.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/tiwit.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/dqm2o8rkln7s4ak9937u6jgvj6/32266204626.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2544825668---ridubitofiwolesosoriva.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607947ab9ea45---loziganux.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9192eeeb---kivanijonopowenav.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/23916371386.pdfIn PDF document text
    • http://poorclarescork.ie/images/zavuzosaxajim.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff6c376c8---84399025373.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/5851420983.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lonokowojakef.pdfIn PDF document text
    • 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_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 10996 bytes
SHA-256: 9d765d5357167d052aff78094750329654ec94a6bfc2c737feee672cd3ad188f
font_01_sfnt_off00011e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13672 17120 bytes
SHA-256: b67b6a4af2d038e9b27a7df043c60570e62f2f8cc3b2393fdebcfa770caf2d99

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