Malicious PDF — malware analysis report

Static analysis result for SHA-256 794c657ffe7e5587…

MALICIOUS

PDF

91.1 KB Created: 2021-06-27 13:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4dc4cb2c7936414cf3b662f222feef6 SHA-1: d2303f661f17a8b8fb7919b230e1886762af3dbd SHA-256: 794c657ffe7e55877b4678408d192d8e0cf5afb2668d38bb74974cfef2c74266
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the link farm behavior is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079262eeea87---zisametot.pdf
    • http://jrpst.pl/userfiles/file/90669364379.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4c0e497a---5363242438.pdf
    • http://brenno-tojestto.pl/userfiles/file/danatex.pdf
    • http://ahsaipu.com/v15/Upload/file/2021513115163654.pdf
    • http://kaies.cn/upfiles/210610170052373612umtez0.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2e923249---21367123742.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076f58030682---gajeleletipejirabofaz.pdf
    • https://vicotelecom.vn/static/source/images/file/memewal.pdf
    • https://bravo-hk.com/userfiles/file/31222873913.pdf
    • https://pabrikangka.com/contents//files/vafagimenokusiroxo.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/d504a907668afed94531039fadacba77/junela.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/g0rt8qlrt0emo4blp3h75o5k70/logumiwalojazoxagewa.pdf
    • https://underworldgear.com/upload/users/files/jeruparivivekamevaso.pdf
    • https://deltagroup.bg/uploads/file/24936732919.pdf
    • http://askort.pl/Upload/file/wobulesidifevaxi.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0b8965bd2---11408832791.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21efdd437d---81587475914.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/95810a0d366db6471286f6bd9bf727e7/60043510599.pdf
    • http://seanmore.com/userData/board/file/44744077756.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/tbh8c65298crgtdk26konads3p/35792198084.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4acf626479---valakikererekazifomegi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=iliotibial+band+syndrome+pain+location
    • 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_off00010231.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 16792 bytes
font_01_sfnt_off00011a48.bin
dfa2e3cf7eef994c179cc3ea66abdc7314daa40019aecd4a5f447d10b2a529ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 10880 bytes
font_02_sfnt_off0001333c.bin
c6bbcb0188bfff48be203974a94c22425f3f8c2b71108c7569ea10c783e02a78
pdf-font-stream PDF embedded font (sfnt) at offset 0x1333C 17388 bytes