Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1fb835989f0212…

MALICIOUS

PDF

87.5 KB Created: 2021-06-25 21:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a18a0c2b44079013980c32f040d30879 SHA-1: 33a8c6a432f8fb9a8111cd9b84fe8605cc66a4fe SHA-256: 3f1fb835989f02122f349e6d51e9cb111194ef13fe969d987c2bc7d834cd64bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://urbanconstructions.org/images/uploadedimages/file/mefova.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080618a1f89c---87557060344.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0fc71a84f2c63e279300b4564980276e/89240274722.pdf
    • http://ajivikafinance.com/userfiles/file/68479705688.pdf
    • http://odpadykj.cz/UserFiles/File/kizokavoxikugisiwe.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b63061282e1---80290485156.pdf
    • https://susta.vn/userfiles/file/82224182537.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/020plqgheprbb2f47b3tlfqr76/mawilijar.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74113fa24---noxupowo.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/9i304afk072491i5numc0s850t/betaduzafodaxizuf.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f2b4d6ca4b8d3f2e9afabb721cc10a15/fomagalov.pdf
    • http://kanstm.com/ckupload/files/vexix.pdf
    • http://pastoret.it/userfiles/files/xipumegasoxujivitatidu.pdf
    • http://clasesholandes.com/userfiles/file/xubokiduzosigopisofukivu.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9871fc63d313975574977bab43084e0/vajogopajibexamepafebobi.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/54a482aa64d0c107d89fc1c6c2d16755/menug.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5ea8b4e3---tukig.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075422d7e243---tokoxozibeviradodevub.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/qeli773t705n039brljk8e70s9/dorenijazupilupomenogawo.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0a4c3eda8b6f0466dfd44dcd58992c74/99555425932.pdf
    • http://rustproofingottawa.com/userfiles/file/7971359643.pdf
    • http://instandee.com/Images_upload/files/66162922844.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=science+equipment+crossword+puzzle+answers
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b89fe3074e5fdef710273c973d08402c/wuwavatubipamulomalibiman.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_off0000f1fc.bin
dd5f94105384a41166cc52149aed9a88fed20c28480d55828d4218b7333a07f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 11144 bytes
font_01_sfnt_off00010bd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 16792 bytes
font_02_sfnt_off000123eb.bin
6477ca94c7f666caa447d6839ee5b5ab14760417f40703deaeee593e6ecba8e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 17204 bytes