Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d435bc13d7b119…

MALICIOUS

PDF

75.2 KB Created: 2021-08-19 05:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e8c1d0d3a90bda0ab6249f56555235b SHA-1: 08054ca18211952c8e5563b60c1b66737944c254 SHA-256: 18d435bc13d7b119bfb69d7e09810e889cfbee302839707c9feffc5d59f36628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/uplcv?utm_term=2003+honda+trx+250+carburetor+adjustment
    • http://allasclub.com/campannas/file/30013090597.pdf
    • https://kfmaccounting.com/webroot/img/content/files/4274688285.pdf
    • https://driftwoodcc.com/userfiles/files/149307541.pdf
    • https://loctra.net/userfiles/file/nobijujesonesorejusejim.pdf
    • https://netiko.ge/img/Data/file/fugowe.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b60883fb8c---30324843428.pdf
    • http://urotunisia.com/uploads/FCK_files/file/34074951526.pdf
    • https://mahae.hu/files/files/88974693394.pdf
    • https://iwanbim.com/userfiles/files/13679541687.pdf
    • https://ivanamihic.com//files/kobok.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607789a913343---18004709480.pdf
    • https://leanuslab.com/UserFiles/file/92193910595.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098264dab576---pomiwixizowafenax.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b2a14aab68bb24e5cef822e4f6d4eb64/nalopeta.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dbd59cb65---tarifuwawe.pdf
    • https://bleikss.com/userfiles/file/44378448442.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df809d5b26a---xejonipigelawok.pdf
    • http://bet-balance.com/userfiles/file/gifisiwopelamaxekar.pdf
    • http://rebornfair.com/FileData/ckfinder/files/20210620_09CC9A87DD7253E3.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798505a1289---96208935039.pdf
    • http://wpscrm.in/uploaded_files/userfiles/files/65241043716.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de14fe88e35---nobexewotimososer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2b2.bin
c8583918649bef9f4c6900c7ed6ea060e9a2e2774d881a6c0e35ae9399bf5b18
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B2 15760 bytes
font_01_sfnt_off0000eb8e.bin
482242fdc9514420081f40c26d7675dd4b9e153871f493ece80fb910bc6037b1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 11420 bytes
font_02_sfnt_off0001066f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 16792 bytes