Malicious PDF — malware analysis report

Static analysis result for SHA-256 979c2409c229cc81…

MALICIOUS

PDF

94.3 KB Created: 2021-09-06 12:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e65df96f10eea036e01b9974d29ed824 SHA-1: b720c21391472258c4e7900e8ba8af6a3f5198a6 SHA-256: 979c2409c229cc81e41135b1639607828da341081e27ac047b5494546a3a5753
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, but the presence of numerous external URIs, many hosted on suspicious domains, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, limiting the analysis of specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1625237831.pdf In PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160812da3f1d86---zudawevitotatuno.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/mofidegukijo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ccfd8a4c---tepafavitemox.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/72601175291.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8c530aa37---25245362062.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/nisozodirezi.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/mobawubegukovuwuxas.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3610d1bcab---vupawodiveb.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/jrnosj0f25d9hnme4ntpu7h0r6/98311758894.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/42687190113.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2214163435b7d495102d668387bd2afb/segarufuvaxufirajasepuge.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/19592533145.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d2efc8060---40969859962.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1e081927---37594287850.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/gezebesupijafiduwi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16126418f6de67---2867373470.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/32302428342.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/gps5rqnvchq60gfj9jo7e71rkj/besojimi.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/55448877695.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608688997d059---mepekovodasotoboku.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0gd18t44630iivbd54scr15er/nuvulavumevikom.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/fumalamiribozimajas.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b53ce720e8---81676038076.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/jotunesuwewumiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=isqueez+osim+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 10328 bytes
SHA-256: 76f15963d1866fd5582ebc7b9236f86c1417a2c2904d97b292b8eb7cfad565b3
font_02_sfnt_off00013972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13972 19012 bytes
SHA-256: f378a13684827862c27c832446e2d6a8064abe38f4cb692c081b0047c2c9610a

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