Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa37d5b25283e08…

MALICIOUS

PDF

85.0 KB Created: 2021-08-20 08:38:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37c85838bb5ab8d0989032d7cb08f42a SHA-1: 421246c6fab860c3913043c77972d7c628956ef9 SHA-256: 0fa37d5b25283e086b1739bf0f03bbd62af6ca8cecf95ab93ec0d801d64578db
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting it's designed to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fad3e71971---94837767858.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3e20536098cb139eb0d0d97f25fd3278/54732304358.pdf
    • http://canadanur.com/resimler/files/dadatejogozigapibugeruvid.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9gbh94u2odefmqsntt7a1jd6r2/miledimukumo.pdf
    • http://amon-syotengai.com/userfiles/file/taxopolajumo.pdf
    • https://airshow-bg.com/file/82298380672.pdf
    • http://nessium.net/userfiles/file/gotevekelekililefobigego.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610058479a4f3---87973989213.pdf
    • http://sunil.kr/uploadfile/fckeditor/file/62692098411.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b568a1ee81---ralemofawen.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109af88bb681---50635063310.pdf
    • http://phongkhamducphuc.net/images/files/tenaremijurodokagesugovo.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/0a94c7ce0164a8e4b470b5e577330f32/xuparaxubukosisuloxa.pdf
    • https://wecareprogram.org/images/file/deforimapituwokagup.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece05d7b40---lifasozawubisosonapofetif.pdf
    • http://petra-dario.info/upload/datoteke/rubejixowerod.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4369431ff---95127614191.pdf
    • http://www.siposferenc.hu/html/wojosezutipepod.pdf
    • http://wadsoda.com/UserFiles/File/75986886090.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2873794801---kowefokop.pdf
    • http://montaze.org/democms/userfiles/file/loxuluxetumadoge.pdf
    • https://atl-50.com/files/file/22114327633.pdf
    • https://b2cexpressdemo.com/userfiles/file/98438395249.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+bypass+nintendo+switch+parental+controls+without+pin
    • 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_off0000e548.bin
8eb50b71a7482bd1aae80351b72dc5bbcc4142b92b8c62302c13c9d4a43a24d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 11044 bytes
font_01_sfnt_off0000fec2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 16792 bytes
font_02_sfnt_off000116d4.bin
0c1158159502881367dc405d736856f29a06912ba7d4c575218212d30769a66a
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D4 17084 bytes