Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa9a8036dfa58eb…

MALICIOUS

PDF

73.0 KB Created: 2021-07-13 06:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c71e100f8c6b903dea8500647a60784c SHA-1: c090b391cf059a381acee383872ea2752c6a6e7f SHA-256: 5fa9a8036dfa58eb70f15d607ed22429f6e64c136885c56d5d85387611d038b0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content. The presence of multiple PDF files hosted on these compromised sites suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c532d97d55a---52148324867.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/s3eic8vjm388mefep97rtqd8t1/fefimuxuzuguvuzomakudukav.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/285g3tka13799onfttv4sgrprj/kakaxewesodiwa.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/jegag.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/70263662261.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5fb18a9f---jinikafajaxetaveberuxipoz.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/pumawunomilepujoz.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/8dc22b2ea37f95ea2cb799c3a9ec7481/jitelek.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i97tqbgpig81gcasu54pimt4p6/67031494219.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/miririvi.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/vetidazusifimap.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1624480066940821540.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/2f2637c7265b624c08321a6d4ab4fca5/zegevaxavosota.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/18641446792.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/bunamukupazumo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6627d48e4---81167047514.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/62167323608.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/wumobazelozukotu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rewunulasumogexezidiso.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/sudalanebakibuvuz.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae43c6d6f4---86273826282.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f3b3f746b96233b02435cfd51be42f70/zitokijusudemodeza.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/makokojexuniwafemigem.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/fm16cldngjdhm1l3jj84fgsa41/puruxew.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/64336156547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cheat+ninja+heroes+unlimited+goldPDF 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_off0000bce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 15684 bytes
SHA-256: 1ba205e38f72b0457fa3ab3fb526559255cd14817129bd50aab8fb812e4f725e
font_02_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 10956 bytes
SHA-256: 27f0efcf741fe87f8b239a28596116bfebf83371ce894f54eddf54405602e2d2