Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb7c50c819eddbe…

MALICIOUS

PDF

113.1 KB Created: 2021-09-09 06:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbfb91a7fb98b5937a717d5d32f6203a SHA-1: 76ae6ac3cc5b44779a425301e1439482a2051a2c SHA-256: 8eb7c50c819eddbe6e4b6e14558ac2db82f41148c99fc36ab8e2ba5e96a56a77
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing or scam content, disguised within a PDF document. The presence of multiple compromised CMS upload links and disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=terraria+download+mod PDF link annotation
    • http://jeyadhurgatemple.com/userfiles/file/42390259856.pdfIn PDF document text
    • http://workontext.ru/media/file/41147292792.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/mazabulinugejob.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/81345365700.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/76025209114.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133bbe505d5b---18695050439.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210906_7FF89CE88D8D7D4F.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/11153584884.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://kayapaliinsaat.net/file/45161718319.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/nokukefezif.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/38470324876.pdfIn PDF document text
    • http://elsped.hu/files/file/6990934373.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/4150625150.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/31412840377.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/39064651071.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/pesitomokufegarese.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/jipemerebitamajexatetelo.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e962e1bf5---temipivigadatalesodana.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324f022c50a---23292683034.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/zatevipevoj.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/bigam.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/lonavapepojudasukaxifo.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/39886754490.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_off000157f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17010 10192 bytes
SHA-256: 05e32fccaec3afffe7a1d31a1036fc59144ee6c9a937662ac9a40f1aec9df9d0
font_02_sfnt_off000186d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186D2 18212 bytes
SHA-256: b1095b3af39022f776a62b14eccc55bd051d1dc4786570f59176499b739b041c

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