Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21ffd78a009e50d…

MALICIOUS

PDF

89.0 KB Created: 2021-07-04 23:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0df5ebfc06eb5a3f896021b8b4a3cb94 SHA-1: 727d81f6272a99886c8361c23f8cb81c0e1521fa SHA-256: a21ffd78a009e50d5e2d2dd1326b35feaa1f760fe054d108679c4fee8105448b
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The 'SE_CLICKFIX' heuristic suggests the document employs social engineering to trick users into executing commands, likely to download and run a second-stage payload from one of the numerous embedded URLs. The document body was unreadable, but the heuristics and numerous URLs point to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://laborke.ru/uplcv?utm_term=recover+cleared+history+chrome PDF link annotation
    • http://bkht.vn/userfiles/file/bujederazejuxep.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0b0b159c---6824042382.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/gosutilewowiga.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/vidijoluwujebazuse.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/51172262056.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087186a0488a---23709991183.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/40170712020.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816d1e09fa---6542320103.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/264bf6371ffc81018a7def1ce26510ec/faxanilelirumumegulozege.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/21030034746.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xewinetixonuxukiwigesipu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/83ac5dsm3brd0hsgmo49rfu6a8/vetamexorawojapusugit.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089098c7381c---kebapeg.pdfIn PDF document text
    • https://atl-50.com/files/file/paxovotamolopijofobale.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160719f414dc68---56641888765.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sujeziv.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cd41a5707---nenolobab.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/tuliwov.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/47609085489.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/zidazadobajejo.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/luwarenubijisib.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/45004143595.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4b2cd16a---xerigikikadazuzapemak.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160871b122aaf3---ludopetukovogupenakedu.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b74bviihp0udfqel9b56p210v/xidumaxatidanofede.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/73067362563.pdfIn PDF document text
    • http://berbun.com/user_img/file/26813811419.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16073342b92bfb---68015808506.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_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 10756 bytes
SHA-256: cc235795f4e12494aab6e5e7e76963db0aa2ecdc7952b53cdc01a3ad20c67eab
font_02_sfnt_off000127d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 17176 bytes
SHA-256: fb8c98de6e4fea32845a84d5b3bcb032e73a4c0f221eda85c2c9fecee15af270

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