Malicious PDF — malware analysis report

Static analysis result for SHA-256 efda9b2f53a90fd7…

MALICIOUS

PDF

90.7 KB Created: 2021-06-27 11:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 697090e138c6dee4f90d20cc2f5c7b0c SHA-1: 0f721814fcbc01bfbfd81d5fcac924b52c6657d6 SHA-256: efda9b2f53a90fd7076b7dd4f1dd4ffc319fe19ff7261fc031d029f510a2ce7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=can+i+wash+my+shoes+in+the+washing+machine
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/7ec2c9474a32bd8809c52b56d66062f0/33087589947.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb0452e1bf---97807817168.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68cc2707b---54628011140.pdf
    • https://llsindia.in/FCKeditor/file/27160274531.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d266219585eccc101de9a71f2dc7aa57/xepifivevarezud.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0e4cc70a6a270889e26db41ac5e73ba7/magumibapova.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcb6d9906---77641638387.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9fd4cbbe7---joxupizivot.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bcaba6578---vujajufezidiwijirokeboxod.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6fbbc9a1---ziriwevofujewim.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7e60baaa6---sixoturuwivivefadeku.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/73ba522f2abac5e833af78f87e0e73e7/sutididokesuvasetalovoje.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729e439fa50---sovipebo.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d5411efcd958bcc225c34094b94fa92c/39541021873.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cecfcb7ef30---84285966120.pdf
    • http://satisfytech.com/ck/upload/files/jujabisobuwapojigerugokus.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607445cce66ea---76546794892.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/gmm38lusn2ji4ri9t59lkoclln/makekutalu.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89903ee19d---27487607815.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607033cb320b9---58043333939.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899a9106cb1---22279131469.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/bnsb7mm7h1asugqjpr7fjdjjj3/73939433405.pdf
    • https://lapalettedesarts.fr/gestion/file/49056133428.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 16792 bytes
font_01_sfnt_off00011788.bin
a9f8610509cc4af00237d31daaf04571e1fd1b51173a164ce586de216d4ca299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 10764 bytes
font_02_sfnt_off0001303d.bin
c6e53fd37d3f1c969470239f4b0ad1633b8bfeb40f75218c5aa78ea5e0cac8b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1303D 17292 bytes

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