Malicious PDF — malware analysis report

Static analysis result for SHA-256 07870fa54e6e2969…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 19:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7decffd6774294960118bf998ac480cb SHA-1: 1bc6cc2913c0fb13317a3468e1b68db645541a86 SHA-256: 07870fa54e6e296922632aa317f67b914912e0ec3e90db70631d7d71c76cb09e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate it functions as a link farm, with one URL specifically targeting a WordPress upload directory. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://nomylo.ru/uplcv?utm_term=mini+military+unlimited+health
    • http://underbutter.cz/download/foto/54296650118.pdf
    • http://pharmorgsyn.com/upload/files/26092470977.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/paveririfilezikelabaxanet.pdf
    • http://slkuang.com/v15/Upload/file/20219161927321083.pdf
    • https://m3nan973ru5-pa571.com/contents/files/serituzizufoboji.pdf
    • https://rugsinc.in/UserFiles/files/6750026551.pdf
    • https://ever-progress.com/upload/files/65606183120.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613057e02db3f---64995207454.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614453bde30fa---bodokopixatatez.pdf
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/bepivixoluf.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/t9qjjm8krjjuk68o5ijfdjhmhqj9p005/83440086558.pdf
    • https://hunglivet.com/uploads/files/202109052302006802.pdf
    • http://namkhoabacninh.com/images/files/27038842916.pdf
    • http://avesta-hmora.boj.se/uploads/userfiles/files/fazafejeguboj.pdf
    • http://dailymaydemtien.com/userfiles/files/44651899103.pdf
    • http://behtarinekhodetbash.com/files/files/gafifarumofanedemurekeke.pdf
    • https://vegas-shop.net/uploads/files/xitowuxiwasikulelezisi.pdf
    • http://relaxzenter.com/uploads/files/70582113201.pdf
    • http://autosklo.sk/pictures/file/85692924611.pdf
    • http://psn-monolit.ru/img_file/files/wiverutanizino.pdf
    • http://duszek-lasu.pl/userfiles/file/25155066133.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95180385413.pdf
    • https://k31szmq42-nu28.com/contents/files/9009603658.pdf
    • http://studioaba.net/userfiles/files/89961867758.pdf
    • http://balbu.eu/uploads/news/file/dovoxu.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_off0000b48e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB48E 16792 bytes
font_01_sfnt_off0000cca5.bin
3e87235e352e6c6ee84b15bebd7213fc951288e696852c3bd002a7176e0355f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 10432 bytes
font_02_sfnt_off0000e403.bin
4f16d88ea67677a6b672d46feda5fa413f449cc6ffd7537cd48a9d65230fb1b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 16652 bytes