Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bf2dc1467d3a2f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-06 04:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 095dccf1c276c0818b62cfb4c0bf8159 SHA-1: c51e53dffd49e14ec1f7c62c1794a7bdedacc985 SHA-256: 16bf2dc1467d3a2fc9d162d2af2c27e60177184eed3979212ffd1c32a6bb9a02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate it's likely designed to redirect users to malicious sites, potentially for credential harvesting or to initiate further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b86f07346bf28f88fa33841b910ffbd1/verovudesugezekusob.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/gogurejot.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/69573235999.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/866379a377465443b4d83c91b5636e13/42068950239.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/40139861341.pdf
    • http://robalton.es/Albums/images/file///jezuluzetoxosibefo.pdf
    • https://506hlapeta.com/files/file/sikak.pdf
    • http://khocabien.com/uploads/files/jalidokiz.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3c9511bd---31082256089.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/04fdbbd881c606748c88980b581a00c9/51246083064.pdf
    • https://toskov-yordanov.com/userfiles/file/43303742068.pdf
    • https://nationalshield-uae.com/userfiles/files/28085179061.pdf
    • http://austria-ex.com/images/blog//file/77330078850.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/58f923614866b4f6df7dc7997ab3c93e/soloke.pdf
    • https://pmfegypt.com/userfiles/files/benowavidurikofuwowafenox.pdf
    • http://jrjohnsonfamilyreunion.com/clients/0/09/090f04f22b165063c0e57546eb93b169/File/61191900773.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1610523d4236c1---74648464764.pdf
    • http://vinmexindia.com/uploads/98791398773.pdf
    • http://cw-cut.com/uploads/file/19812882405.pdf
    • http://quaint-house.com/images/blog//file/61900860107.pdf
    • http://beveragesgs.com/userfiles/file/nobidawumaxezonavi.pdf
    • https://rugsinc.in/UserFiles/files/73644698807.pdf
    • http://suachuaspa.com/upload/images-content/files/83396295423.pdf
    • http://kdekdyjak.cz/data/49885013547.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/22066038265.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116959f3bde8---moxugiwu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=harga+mesin+peniris+minyak+manual
    • 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_off0000c968.bin
251e6fa3be6127f2ffded869dacbec9e30072ec46d027493dd72aeb77095d8a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC968 10676 bytes
font_01_sfnt_off0000e1c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 16792 bytes
font_02_sfnt_off0000f9d6.bin
5a4e184fd48a9e41c5bb40a1cbe13f05d54913adf17d16e230cc6c18c0e3e309
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 16260 bytes