Malicious PDF — malware analysis report

Static analysis result for SHA-256 252aa168b690d26c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 03:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79b0ff364526b18924f9d031617f46c6 SHA-1: 72c0ef6add17280e05179f8e72a1c54b378be4bf SHA-256: 252aa168b690d26ca798cd39365a1788a9485eceec37fd41524ce504847dedbc
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content is designed to trick users into revealing sensitive recovery secrets or private keys. While no scripts were explicitly extracted, the presence of multiple external URLs and the nature of the lure suggest a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://chcial.ru/uplcv?utm_term=implementing+elliptic+curve+cryptography+michael+rosing+pdf PDF link annotation
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/lr1sb0fac8nntse1k6ftsu4c03/61383566752.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b378a779b04---vavaparogapuvadix.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/38224176347.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/98o6vpur7tp115et0urukkf3a5/77615115152.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/kerufenerole.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160daed947cc13---82055591576.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/tavebexigagowotipozo.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/rajetogirasunikuki.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/341ab22ffd83f345ec756fa721159235/11824667757.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/wonudemizakojajukefoxosu.pdfIn PDF document text
    • http://erpos.sk/data/files/dufija.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/xaxaruduxanujuvotubuvo.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/vmq2bl3lj3ehcfrc1kkc3jopbt/nefowukigetan.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/74055738183.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161235f93524ce---jomukoviku.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/kitidupurinirek.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/kopupisukuv.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/kikenipepidamoxire.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e705262ae7---10580996699.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c80088b96f---zovusefepasus.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609726b506bb7---69829047574.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_off0000dba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 18268 bytes
SHA-256: 566e08011a14fe3acbe0a48bba922ef9824dfe914ea9bbd61efa36bd3f19ddc4
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 11300 bytes
SHA-256: 08200197d0c30549bea8b844ecfb4bc35eb6d96e609514cac6b9b875ef1edf51

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