Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5cbba86b6d9dab…

MALICIOUS

PDF

101.2 KB Created: 2021-08-09 15:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 43cf6ca09a463a6bf21876ba831e6beb SHA-1: 8f06ceee34e71c7770892676e73ec6dd40049810 SHA-256: 3c5cbba86b6d9dab0c5949516c220ac7b2ce1c501f26ee3383483f085b4a8333
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/89951442705.pdf In PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/39bb69b9b5b7528dcc38b65c71015bc3/nexekowebupowiv.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d8e5ebfd70f0fda0f2044f9709a649ec/3722112849.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/vugined.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/82120109759.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/16200083846102e93493d38.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ceffcd7e2ff---sakeponorarefasigizigi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5cc7134fee28c2eb0b1c6a3c1dad20a1/11997753799.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/36qclajhjpkjfv742kv7l76irj/vepatuxolesilasewepirajo.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xosobamowazi.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/wumizodisija.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/larikulubegorore.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/412a2d640e029e086a602b74368d934b/8683470935.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d29bf1a334---36780464714.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b1765efa9bf00abb638f9e993119d70e/28687539812.pdfIn PDF document text
    • https://slide-bearing.com/d/files/86713209001.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5091a1394---damazuwekegikofa.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16207789908987.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/46751968938.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d13125ff1---xulipelutipive.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9b9cae876e46aefcc406264638e758d7/68535404046.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd90bbe84e---bujedugenagowujujad.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba988080096---sadanuv.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/81604287059.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/68102420382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+write+an+introduction+on+a+case+studyPDF 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
stream_009_off0001659d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1659D 18912 bytes
SHA-256: b3ac49a27e419f062e7eb0830915dc18946aed73528e894bdc38d4261b6db16d
font_00_sfnt_off000105d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 18076 bytes
SHA-256: 94354165584530b3de612a4f8c8aa9db28d394453219d29e0f3e8527a7348606
font_02_sfnt_off00014d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D36 10608 bytes
SHA-256: 1b56fb60d6d2ef35318b85a1d263834ab6dae85e1e079d200d09a0235709a297