Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d4ec743559bf66…

MALICIOUS

PDF

92.1 KB Created: 2021-06-30 17:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5a729b415669aff9321b1d32f947a0d4 SHA-1: 830450db183074823537a6018ad973c885fbffeb SHA-256: 75d4ec743559bf666a68d0c2b76f207038b809acee737aeed37e693bc0883f64
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of 'utm_term=reboot+recovery+apk+no+root' in one URL suggests a potential lure for users seeking specific software, possibly leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/df2655ad8bdb11c77de6e00acbcb58d5/wivinaletezederaropa.pdf In PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1d12a1617cf9e03e3e15fab2138cd841/26387710807.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4ntlhpqdvd6u5pfcb8uhhjl81/67383896660.pdfIn PDF document text
    • http://zae.me/datafiles/file/diguwuxanogetewupupudije.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/maralotulujuworuf.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06b0769faf---puzoletuvo.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/6660856094.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/95312850101.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/edda6d40a433d7d1d6815087bc688358/68423489701.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081621b35b52---81804232423.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7f8e214d---bokatubapin.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/zebavuf.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/603e455138967b6100d958797b36f653/37273276189.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/0qtv8vicffgaha0v76dru1aab6/67986748158.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/04de8361ecedddd33170d2963972ffef/wekezi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160771d9797018---12170643646.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbd619205---46796804904.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/vuwavuduvi.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/gokoxedobodibefaj.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbd7fd20ce---109340042.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/buwijozufanazanidaxobawi.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6fe91b6e2afaecd228e2ac201da38631/17613602072.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a418b7b4afb---71637049400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=reboot+recovery+apk+no+rootPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 19152 bytes
SHA-256: 0069b96ad39a4ed867ef796ca36a9dd8a1d1e592b193220b317110a075b59f8e
font_01_sfnt_off00011d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13542 10516 bytes
SHA-256: ad260cf95c28c5c2ff964deebe5487a8794638f620d446261199abaff50b7311
font_03_sfnt_off00014d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2D 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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