Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a667b233645029…

MALICIOUS

PDF

80.2 KB Created: 2021-08-27 08:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38566a40213d93edc52816da85cce9f3 SHA-1: b65c496da15d9a1acb3df2c5bd29a59ff089e55e SHA-256: c5a667b233645029b2b8ce9371e91231247d520e0e5bd034def393a75a753c6d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=30mm+convert+to+cm PDF link annotation
    • http://enjoy.sk/editor_uploads/system/files/ranuwejalexoza.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8h74sn13fpndv33pgre00v71q2/muxujuxasubugu.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/sejur.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/55711544483.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/tinujaxafunaveralibasorot.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/85349867311.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2ac03cf5---63254883647.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/71630830679.pdfIn PDF document text
    • http://4bx.pl/public/file/40697808368.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c39bba78954---zarogi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9bcd2c00d---kisabajigabemajulokip.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5e829420e---fetupixafawovenisumegim.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/30937956885.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/zamerokewesapital.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/dbac1d2282654014a0a04e2b0d8ab362/52428985211.pdfIn PDF document text
    • https://palet-school.com/files/files/56933376361.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/vqscc74ectjj3baied8jckle62/24823321924.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/bnld2hb8huvhrdsj0gem2d21hg/77852480298.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/kuvufu.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/tolulabifafabuvobidowuwe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7862d5d1ea0b48d2eebbf3add7d2077b/6107561422.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/00574d5b34d627904797f913b0c92dc2/15732140370.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/31569299520.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_off0000c38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38E 16588 bytes
SHA-256: d5461d5eb6f99c9092ebb10248db519d21e4cc18bb60e9271ad2b8e59cfdc1b7
font_01_sfnt_off0000eea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 10188 bytes
SHA-256: afb295e1b8f04cdffd718bfc4eae94486d33ff61f4d1cdcbc2c8e9754abe9b95

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