Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6792679e8cb167…

MALICIOUS

PDF

107.5 KB Created: 2021-07-26 07:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61940e3e79fd1783e322af6c20d3bb29 SHA-1: 318c62aeb8c67dcdc60d55400cdcd2b02f417481 SHA-256: cf6792679e8cb16761a28cd06c6a9c8875a598ef045900e69da317182e8a4939
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution, disguised as a download link for a Bible-related PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://duhochmis.com/files/uploaded/files/fowosinibenakej.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9fcc9116---65661464900.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/831f0bdc0eab9321b77dc9b9ce4e8582/13876534710.pdf
    • http://superfishinglewood.com/uploads/files/xisutowabitu.pdf
    • http://chokmanee.com/userfiles/file/68165032048.pdf
    • http://agierresrl.it/userfiles/files/teninapupexisitesotono.pdf
    • http://navigator-nsk.ru/userfiles/file/rirolajitavewetu.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/08a2e3ba44d5ac3379da2ab1289e5035/4970755676.pdf
    • https://wheelmartthailand.com/image/upload/File/41543298740.pdf
    • http://secretlove.ch/ckfinder/userfiles/files/71419585363.pdf
    • http://mtjjt.com/2013/upload/article/files/210710080420564159gki2k.pdf
    • http://massimomoroni.it/userfiles/files/22174078178.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/tejavomupiketulew.pdf
    • http://gewald.ru/content/Files/pigojininafefebotoko.pdf
    • http://stacjaregeneracja.pl/userfiles/file/kivutatawudutobudujipuju.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076967e76af7---81715619834.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3f5eb9df---48776731839.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/23733382402.pdf
    • https://ivanda-commerce.hr/userfiles/file/47887924794.pdf
    • http://casaalu.com/luutru/files/gatuwunufaniw.pdf
    • http://orsini-blasioli.it/userfiles/files/geresufujeru.pdf
    • https://mangonebike.com/uploads/file/puluzizizave.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bible+ya+sesotho+pdf+download
    • 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_off00013d39.bin
2d8a4f2b6499b38cf499ec4132974bb261b31a51b22f732aeac8bd2168a9233d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D39 18592 bytes
font_01_sfnt_off00016e2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E2A 16792 bytes
font_02_sfnt_off00018641.bin
007d456e648412539d0d0407dbf8d3ea259b08925fef283cfaea549159d43bfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x18641 10888 bytes