Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf241bb049dc105…

MALICIOUS

PDF

80.2 KB Created: 2021-07-22 15:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1b43f05d9d4ea4fc145fc9153c033070 SHA-1: ce66ae500d9201b60fc2c68480e05f8d38a88aac SHA-256: 8bf241bb049dc105170a065123acd5a492e16ca4778ef0f651f6a3d0c471153f
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or are part of a link farm on disposable hosting, suggesting a phishing or SEO manipulation scheme. The 'SE_CALLBACK_LURE' heuristic also suggests a potential callback phishing or tech-support scam pattern, although the document body itself is unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • 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 http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fa8e8b6f---68172433530.pdf In PDF document text
    • http://provia-events.de/pics/fotos/1/file/suworilisagerifubufebagu.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b19edd85---gagijovumadi.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8fbd0b0de---32690312806.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/57419009623.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/kikarugozovajexesin.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b70796f5fb13fbb8c0fac1b5aa56cbc5/83142449471.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634461bead---xixukugisuxuvusumibis.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a6bd29e14---42589472636.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/taxako.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/23122116796.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/begafip.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/nojapojoxiluwupomaxekik.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/62712393167.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/11127759198.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608081ea0ac40---jusevukifubimizigav.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51b3c4192---85375093900.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51ed309a7---zuwusiwuvugevizosoxudew.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/90999818593.pdfIn PDF document text
    • https://noddy.nu/images/file/mojuperatugopaw.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/73616422668.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b9e745238775ec2135d2a247cfdfd122/16837860731.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1rn3171ikl0s9e99n19pdo5bp4/zudalizef.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/10432859641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=advanced+nutrition+and+human+metabolism+5th+edition+pdfPDF 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_off0000cc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 11308 bytes
SHA-256: 14cdd25cc95d4bf5988f2dab06464f871c0c30701bdc39138f4a66da37308980
font_02_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 17556 bytes
SHA-256: 3f112bed561c085b1fa0d98a549f597e5e911739f0ec17c5a3119e5ea0b129a8
font_03_sfnt_off00012af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8

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