Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ca6a0d0d44d13c…

MALICIOUS

PDF

107.8 KB Created: 2021-06-30 07:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b3f24121f1b64ef62ea314622e1e125 SHA-1: a79d4f1fd8e4e85e352dc243cf8222a38a470df8 SHA-256: 20ca6a0d0d44d13c2c13e4684739602293970909fec66abb92bab1e151fcef75
156 Risk Score

Malware Insights

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

This PDF sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to lure users into downloading further malicious content or visiting phishing pages. The document body is unreadable, but the heuristic findings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/90elu217r7dhtase000eng20bo/45449594988.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4fa5409cd317da23008ace1e1106c2e4/zekizoxonaju.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877a6c390c6---tesuratusa.pdf
    • http://bkdesign.ee/userfiles/file/sileviterezififobivokopex.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/pofanarezilow.pdf
    • http://candientuvibra.com/images/file/ranimatefoxusupatiti.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc97888c29---depoxelopapimap.pdf
    • http://rolmech-strzelno.pl/Upload/file/35104774981.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7da77b951e---60519047541.pdf
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/42241689161.pdf
    • https://mauspro.net/upload/files/91873573857.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/5678293729.pdf
    • https://emmaushuis.org/pages/58867451421.pdf
    • https://acgroupenterprise.com/userfiles/file/65953956994.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/47c5788d6676bb78b0248567459c9927/zagimuwiti.pdf
    • http://aldo-ins.com/userfiles/file/bakan.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a19218e0cc5---90388775206.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/8011afd2d2d9d924005262ad469383bc/92433177176.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c319948a49c---tufaguwawab.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607013d9439b6---finubikajoko.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8c38a4e4---pewuzudi.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ppuuutqonnl4dd3nsa9emht2v8/72895814755.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc60c2c4f7---69758919297.pdf
    • http://www.sport-konyv.hu/userfiles/file/miralav.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a7515e19---39133874789.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=nonlinear+dynamics+and+chaos+with+student+solutions+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_off0001434f.bin
e839d22cd8eda9c9b91be0d30ff7d589778eea0b91df718001c9c7e4f0352f2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1434F 16564 bytes
font_01_sfnt_off00016e3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E3C 16792 bytes
font_02_sfnt_off00018653.bin
6855a97e03c64e7d9a42fb7f8af981e3531c15e3dff5e1a5361f832f08821e9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x18653 10912 bytes