Malicious PDF — malware analysis report

Static analysis result for SHA-256 080e8edb73e288b7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 11:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a23d79a055c430878a40e77c0cc0effa SHA-1: 870a943f129224e64648bce1c99e41a61237357c SHA-256: 080e8edb73e288b7b9e99054232a65e9b05a5cbdea75a615994e8a8c28e2e103
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nayyaralidada.net/alpha/ckfinder/userfiles/files/50220485152.pdf In PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/280d37c86426a985a60af1e6153984b7/siwumelej.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/l4arnn1kt4k3up2oapednflr5v/83898012355.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3c0499280674933eb63ceeeb9561517f/pawuw.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5ee42f1300859118772b5dea46953fc6/bikuwagiridizototaw.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613261ef2ad7a---33425723318.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/28389432558.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/patodekexenarativ.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/9jromu6j0bkclq5n4mthdovel6/92487158374.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109101135214888.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/38140027274.pdfIn PDF document text
    • https://jin-ji.com/upload/files/jijomunamizodore.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/jogevil.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b747268a87---32762280929.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/fuzafurepaburunilabofe.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/lujikibewebukeluwovowuli.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/jewuduxesorotarefusonimok.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bapet.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/gawadijozuledinimam.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/43199697615.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/sojuwo.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/8071367482.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/zubitibotanu.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/85916844647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=top+liveable+citiesPDF 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_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 10332 bytes
SHA-256: d8861b582bfd3f21c6dfc07a01d760937a577dbac30f7b0559fa6713349c11e7
font_01_sfnt_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 18172 bytes
SHA-256: ee4b62b7defc5f05b9c2d5a42bec92ed07638e0c98c372aba5988c2e1c4e3b91
font_02_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1