Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4dc950ff57e3d4…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 16:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e41333bb6991281a351692dd7f24573 SHA-1: ba2b40d414d4f52cdc73add1c322e4e049ee6185 SHA-256: 3d4dc950ff57e3d42e9cdc6a96cee0c7b5ab0dbbe63979e68c2f599e92aa452a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/f915a74fefe75e678aba5ccac2058e22/tapojosugasutalapemebizog.pdf In PDF document text
    • https://asesoriagade.com/app/webroot/files/files/84768209963.pdfIn PDF document text
    • http://vizcsap.hu/files/file/wawijidowotafuwexazu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faad2a96231---kogaw.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3b0c1b2452ef4d6e88d44ac37f108055/77206890457.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/gasatarigovi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093036addaf5---fomutefoxufade.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/jeguferapivotizukonadifu.pdfIn PDF document text
    • http://modern-pro.ru/files/file/12813312682.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/gozuwu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1c4ddc108---3842655346.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160de64969cba6---43709648799.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/jacpuvf5c63fgc8upbit60c2p4/74347956671.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/69884226508.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc88290daa3---16932879720.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/qqimc9rdii5ujhb77cra0if92a/kevexotisekifop.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/runamijomodupunakajani.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070454d75923---22309365296.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/nimegarevuvaxizeloxazaj.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/10650760777.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/nitimobareloletudezunig.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/zivikudexelesagolozevi.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/71594177720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=physics+lab+manual+class+12+pdf+keralaPDF 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_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 11288 bytes
SHA-256: 0b924d9d8b0311dbb570f8ce87a49e6152c7afaae562de6329fbf8d6f15cc196
font_01_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 18556 bytes
SHA-256: 0f24418c819a39103658c2074355804ab877b94ecaf9e6525417791b6bdfa6c1
font_02_sfnt_off000138c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1