Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f38f3f6e824aea…

MALICIOUS

PDF

72.4 KB Created: 2021-08-31 14:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4d102477f54d983ff6003d5db1b3e202 SHA-1: 30734683a92895605bc690f0dc709be587443f48 SHA-256: 75f38f3f6e824aeacf9201c6f5cf0cd4f0c837516c49cab0e3c9df9524b42f53
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 0.9971

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://chp-travel.ir/data/file/70733715353.pdf In PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/drf85ohv0njjpk8vl1mrer2j24/jotewedadagujosusaluvalo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b163bdba5e9---41531034323.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/lerobawukufazasajama.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/j0lhgj5jk1mhehdn7vpcg5oqn6/tadijapizu.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-21/20210621222131187607.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611173b0c4f4e---27605947501.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/26b2d5dbf50e662ff95f50a086a7b015/suvotekonagulavegu.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/vixupazidoluvefofumukepa.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a3d578fd8fd7cb89891f3cf73d131128/vizonil.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa14285f53---52846782364.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/70284911271.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/59390996865.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7e5f3354d4f15400a25feeb9239b5f9b/96943794909.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb09dd19f1a---45460881690.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/69813881447.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e20d3ec5e89b26c413073b89a8cd4b12/76752831336.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/bad476e1c67bfc0be3a57a00d1c0f912/zekepotupipenademojit.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092695054b4e---dokoxed.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb24d44d972---17544952256.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/62030982885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=quantum+many+worlds+theoryPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 16184 bytes
SHA-256: 8017065bd40c9c205b62265147dbef75ab5f52e7709f7d13bf8c5ed9a593d114
font_02_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 10780 bytes
SHA-256: a3c9723f8b630737592ab1f73267a1d1d36b999646c6b84ad40a7865d0da2f1d

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