Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cbea4634c24c27…

MALICIOUS

PDF

104.6 KB Created: 2021-08-18 03:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4620c49958e38174542d5f5bceeb6770 SHA-1: d418946dd1969ee9645bb6f1c0a3533721b675ae SHA-256: 99cbea4634c24c274279584e619c298da35cc73f657f68d6b21d8e3a584fec8f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document's structure and embedded links strongly suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://smaransaving.com.np/ckfinder/userfiles/files/13733077978.pdf In PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/12851451539.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/38958825601.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad52003664b---woselidojewaro.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd25779d988efc43d2b01de6c0422e16/xujovezutolitujikikizomub.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/momipi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/36350235855.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/dizotifetabebunerizevulil.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/24096600035.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c937dff33---92765688200.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/josugupefosuxorowase.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/tadibilojererugi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610658ba5e387---92379791327.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210703_DAC37E6F9093034E.pdfIn PDF document text
    • http://congtyvima.com/images/Download/tadugaxelatimukidinefu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072118a2d0ce---xajojeveranizuseda.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/i75df7rf6r8ipg6rhb2tfdls47/favamodebigiwivudamaji.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec12fe8abd---57554525709.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/funuguxipimaf.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8a5153aa---lunevigetebujufetifejofab.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/7243434861.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0336b007c---kozagan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=awd+system+malfunction+2wd+mode+engaged+lexusPDF link annotation
    • 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_off00013858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13858 15900 bytes
SHA-256: 50e611d357f344a11b896c0d66be24dc658710ba08fa870d901099654732d185
font_01_sfnt_off00016114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16114 11220 bytes
SHA-256: 07142b51540d9c94ab291794b2f0926c92a705ed573a325b6b1514baefc1d520
font_02_sfnt_off00017b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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