Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec8af30761773c7…

MALICIOUS

PDF

83.0 KB Created: 2021-08-21 23:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c95cd48208ffcfab99f3c848e61ac4e5 SHA-1: 32d8105a12c5a8f4b5f8f6cf1111bb962965e312 SHA-256: 2ec8af30761773c78cfb3314b2338fcabe11c73d5b06373bb4fe898bd26dd2e3
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a phishing or malware distribution lure. It contains embedded JavaScript and numerous links, including one pointing to a compromised WordPress upload, suggesting an attempt to download a second-stage payload. The presence of a visual download button further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=leta+sound+booster+activation+key PDF link annotation
    • http://10glazsikeyrosa.ru/file/44587217296.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/39973809858.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/zovuxitirevas.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/10700749559.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608c65be0cb50---kusim.pdfIn PDF document text
    • http://schokobrunnen.com/idata/nogapamatugedox.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16084d03490777---semoguzol.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec39ad02a2---28087012636.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/2966314788.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c78eea5e12---60647375797.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6e41ccf205f76782f356822dbe12ed46/13278597187.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/89094515858.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd338a703de---simoba.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/57521551635.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/kuzedujiwugededufo.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/vapabiwovowunujoriw.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0997236c5861091d707c318274c3ecff/54237552862.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wifefamifupazux.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/vetikufezu.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/33855902690.pdfIn PDF document text
    • http://eichler-kammerer.de/senexanojejudibiwidula.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/65636902214.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/xulor.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/1762426571.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 10788 bytes
SHA-256: 4a9f49150b352d5790c0288eef8e243cfc01506a223a8ab1a96a83153f6176c0
font_02_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 17244 bytes
SHA-256: cf70c09c694b15f675a777e9da508bfb0996df910d79f3f3b2dc4a478f83d811

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