Malicious PDF — malware analysis report

Static analysis result for SHA-256 386de987da5fa1cc…

MALICIOUS

PDF

88.0 KB Created: 2021-08-31 02:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0797cd524781de93caf9292fba4cd7b8 SHA-1: a63be55c597cba0bc84d4b205af89ded298ea0ba SHA-256: 386de987da5fa1cc68a1819b15e809c75ff798702505b20a98f75106e2f973da
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable domains, likely serving as a distribution point for further malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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/1607515c9a369c---59915081377.pdf
    • https://domilot.com/uploader/files/ladebokixoluwawepabesi.pdf
    • http://lyzjkgm.com/d/files/64784903507.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2a1cc9a19---kisanugaduritagaza.pdf
    • https://wrd13.com/force/file/fojulelagela.pdf
    • http://casaatlantida.com/userfiles/file///pazefigefazokarofewived.pdf
    • https://vayoto.vn/userfiles/file/98965799511.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda23704d0---76045836004.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb71ebe6f78b94d9ce23e35be7bed330/nejut.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/25496056078.pdf
    • http://pop-around.com/file_media/file_image/file/49305476936.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/57hr4bmgat5usjrie9faj4cb2o/zemadurosoxijasitozoxowag.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/bq2v71vrirp4ullleo6msd626c/bigoze.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/32d8ff672fb4aaaac9c1816997132479/39566914499.pdf
    • https://nasikampung.info/contents//files/76520619180.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4857733c7---kamuj.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086c21bcb98b---dipaz.pdf
    • https://bazab.ru/ckfinder/userfiles/files/52713474213.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/rnnnn2j2f3psm84jfe1t5iaaso/sojimijijojiledunu.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ac910af4cb2e1d1c93f3cb20c88d8f53/nivutuxepenefugivirovawo.pdf
    • https://ccichn.vn/data/upload/file/83832511971.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e933f770---nulelupupuxul.pdf
    • http://ovodatar.hu/userfiles/file/17939865176.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43a10357c---82544916739.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=say+yes+to+the+dress+sydel+curry
    • 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_off0000ed17.bin
20e9f4206982ba20a3f5c413789949bb70516d8e12a857c2a6d4a7f22a4f5f30
pdf-font-stream PDF embedded font (sfnt) at offset 0xED17 10560 bytes
font_01_sfnt_off00010559.bin
38401f4644d53e6de746648150da649446455d7c6b977b70ecb94d9f6da6f0fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 19680 bytes
font_02_sfnt_off0001393a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1393A 16792 bytes