Malicious PDF — malware analysis report

Static analysis result for SHA-256 16638f8ed40250ff…

MALICIOUS

PDF

91.7 KB Created: 2021-09-01 17:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 280c5fec3b9522fde9fddc7b98d49335 SHA-1: 77bbd0ef2e5796c3f8acb1b631ae991fd09f63b3 SHA-256: 16638f8ed40250ff69c6f93186efe1966b66317973de67f654f9860eba75b7b7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple URLs hosted on compromised CMS platforms and disposable domains. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://akcjonariusz.com/UserFiles/file/mikusabanolipoki.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fe2a13875---dojopiwaxefizilit.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/vf1rujpivevggdvrh3je4ti3ro/52054887531.pdfIn PDF document text
    • http://cuiquji.net/d/files/sikapegow.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/33983229736.pdfIn PDF document text
    • http://fullx.net/files/8118856050.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/67406601332.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6849d66f3b---dibakobepo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/buqs1p0h6ja6b8l8abnvlvqnt3/jujawarelewu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430014539182.pdfIn PDF document text
    • https://easybuildapp.com/files/uploaded/files/matoropaxavusopemevinanu.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/bimijapar.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a754f045a07---jebobufitek.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/8a46765cb9df78db27455b1c134af4e2/tufafetu.pdfIn PDF document text
    • https://ms01bet.net/contents//files/36901902054.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74157765282.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/55336310713.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/33241906769.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/99382950112.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/16ef03ea37b2659fa4856d9ef1eb8c55/kegiwenoboxuz.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/ganunojogoduk.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca17fc4562a---42773972373.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/31976077010.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/nanapawopufegepon.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608226f5314ba---wulekazexapopukexaro.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/56942504077.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/serijaxufenupevejuxuzir.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/janisop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=japanese+word+for+peaceful+warriorPDF 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_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EE 19052 bytes
SHA-256: 7432fd7c53427ad0837e6f50b0cec551fe9c11f4a7300eab165e0fd13cf1c6f5
font_02_sfnt_off00014882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14882 10692 bytes
SHA-256: e801b3c0eb4af5a55eff16811cbff9447408821ec0ee1c55000ad31241fb720e

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