Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd532fdf716cb69…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 20:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3c3c811eee11a9a4ee3df25d22c253e SHA-1: 6701610ad2793c4e93a80e2a14e1b5dc28296ac6 SHA-256: 6bd532fdf716cb69177b7faa7a9a9c12b17cd5215ca51005ad0c38e4b1e3b19a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common tactic of using documents to host redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=roblox+robux+gift+card+generator PDF link annotation
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161319f5388526---bironotobelopugozuneg.pdfIn PDF document text
    • http://gro-felix.si/uploads/32391165792.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/zixumumutux.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613548ce1191e---59233642014.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/1973504439.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/nazifolotalit.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/52836388565.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/55968206083.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/92857062236.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/303c64636a751546276ae6399460b02a/japepipaziniponapa.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/81113811300.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210913080411782.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/251492378.pdfIn PDF document text
    • https://akvaguru.hu/user/file/56779107926.pdfIn PDF document text
    • http://medica-brno.com/files/butoxu.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/82238209771.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/88337303077.pdfIn PDF document text
    • http://mega.kz/media/upload/files/nedalikubexisifibi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141699a12e92---kofumizenatimidokip.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/28909448495.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/tejipoboxekejiromegifilab.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a0d28e01---56954733761.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/furogumoj.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/jokekolidipajojega.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_off0000c278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC278 16740 bytes
SHA-256: c68febe45027d3927efe3899a32ff00c6824782d44a17faf8251e3702ea8d61f
font_01_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 10872 bytes
SHA-256: d546ee946bcac8179f9418501851627cd33a1bdd5f4c85823250f121fb9dc0ef

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