Malicious PDF — malware analysis report

Static analysis result for SHA-256 249d815f69c2c3ea…

MALICIOUS

PDF

167.8 KB Created: 2021-06-25 20:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b5df3ba2a89a20c566ed7f66677027bb SHA-1: 12acf92534f91e79c8f9dc113cb5e709cd790444 SHA-256: 249d815f69c2c3ea485bb2bfecb21f337a63d45b1d81b80698e958bf81fd988a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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 http://energo-winstal.pl/userfiles/file/tipenusemo.pdf In PDF document text
    • https://ahreco.com/uploads/news_file/97795554426.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a564520a410---63842003888.pdfIn PDF document text
    • https://subarini.ro/mm/file/25745663810.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/99319499697.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d14afc1a---suwadubopigotubese.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160735ba49521e---9506343725.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc4f571a09---57604953532.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8371564ad2---xevapixugix.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608b929b0b875---67987214142.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sugakux.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1878a84411---vuzinofifuguna.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/tawezogovixozabagenekefew.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bde189eba---kofifamapow.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160702041091c5---23117802829.pdfIn PDF document text
    • https://silga.ca/userfiles/file/6669868147.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/fbe5e881fb2089ae5d9eba22de09089d/zoniminizojojig.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdbd0204fd---gujozowetuzezas.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/81917350298.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/44rmase4bbuhakmtv1lp3rsdr6/5372774850.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/eb4e4vcra38esmt5gn9flktfns/18653809475.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddc21a53f1---44995129201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cut+my+arm+into+piecesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21104 18680 bytes
SHA-256: 1eafcea619ffb12051d99ee227e72671adaf6e56a9bb2f90f5fba4116cc90e1b
font_01_sfnt_off00022fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22FB5 10736 bytes
SHA-256: 02c3ca3efe128a5ef1b24c3acbea4023690666b3910c4a144dfe45ba0eda2385
font_02_sfnt_off00024871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00026083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26083 20164 bytes
SHA-256: 3e8be3a1046ab0a630a62bb7b2289ef50587665fee83447c6be4d54734d9912a

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