Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b6a0f12a65d198…

MALICIOUS

PDF

95.8 KB Created: 2021-07-01 19:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d01c655d87ad37f3ec4dabac2b450c15 SHA-1: 72349333c967d03bfa1fc4f9599ff715d0c0fe03 SHA-256: c3b6a0f12a65d198308dd3750e446cb90e3434f1ed03852851154583319a1487
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are WordPress installations hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The document body is heavily obfuscated and contains no readable content, but the heuristics point to a link farm designed to distribute malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://thaiwoodengames.com/files/upload/files/ravaxagujeka.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7eec0304b7e26a0236d08ef3efd6ee91/penenelufulugaxumet.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6uhdhoc53ptv4o484g59srsq1d/buwabiwitimevasa.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609448546e414---suvapuwebexenaf.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c52437711---85326154867.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/vuwekadubekosoj.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ffaf26513---54761394641.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079712122228---fijet.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/502e65ce74eb4090d98ac0c1810e80f2/87288537801.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4rdqihqu0olkaddk46s7l1na52/fujekewonule.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e220a9672f---64634156957.pdfIn PDF document text
    • http://billsky.ee/files/file/61444430546.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799dc86e80c---nalawatamafaboriketaxuwev.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/88162288549.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5s7fsojijubmot5i5h5bb42vl6/8188070417.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/tiderunarana.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/joxireva.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8ff9971c07795285ca8c1381babf61fa/laxabore.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/zofozaxovikofirupuki.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7394ee929c---55692871767.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/99596744235.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/zixoteximabaxidaliburuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=8th+grade+word+problemsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 16312 bytes
SHA-256: a5b8e844b40571a899d6a1169bd61ece60444e24eee7dab8819379d50969e8c1
font_01_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 18184 bytes
SHA-256: eeee4cec3933b23d7c17e46f609e07e9a4564517537bee04cfb82814356c659c
font_02_sfnt_off000140b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000158c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C7 10980 bytes
SHA-256: fcf39860c5c165b0526ba9f701016add6fd7da9cc9f2b46a7dad90ccf446247f

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