Malicious PDF — malware analysis report

Static analysis result for SHA-256 c667514a4934ed1c…

MALICIOUS

PDF

94.8 KB Created: 2021-08-07 11:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1a4cf5f27db852e1051df60f9949e632 SHA-1: 402c1cd13ff5fc8173e426b0335e79780e25678d SHA-256: c667514a4934ed1cb077594b1595d9a2471374802e1f9770cf49c8a2d38611bb
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 0.9978

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://ketchas.ru/uplcv?utm_term=idade+iran+angelo+de+sousa PDF link annotation
    • https://susta.vn/userfiles/file/19590556141.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/jagirevepularivumuvekuni.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1250ca31acf4c87b6151c700b77723a4/31093243750.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/bizowafobiz.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4560e3dd59---wulozewoviwawuwikebatedul.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/11b6d3230ed3c6d1a32b972863ec5f36/weluverop.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f449c678fe---60426732261.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/sisazekasulejefazuv.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/16427792372.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/nuwexosoxijudixaduwen.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/55749071917.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/76447771525.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/70960566528.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa2d96544---bodipobebefulaj.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/25607751203.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/rugej.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/54668215138.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/9mo667a3265laldn19l0nbahjc/49101948608.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd871072f---29255505964.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/lodabomi.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2928170735.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ab4f616484a9c59d6593f8a1ced3b646/xotoredugidezaketokuv.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/95bce8f2cd5306e12e39858ddac52872/28581200070.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/14ec0ced51b55d373bc855ab81d00138/36406299095.pdfIn PDF document text
    • 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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 21744 bytes
SHA-256: b63737b01a1da49ea0477dc402b0c13584eb26f8e32a55fa28d3351f399abf50
font_02_sfnt_off00013be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE4 10376 bytes
SHA-256: d66d62463e44331d03539ba0e33fc7254e41575c419badc1240b046153d3cc4e
font_03_sfnt_off00015330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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