Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc085ad009856d4…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 01:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3770a057af31512e966e33cee138bd47 SHA-1: d8505c6c82d16d7f18f92c20d7c25fa2a3ee65c3 SHA-256: cfc085ad009856d4a440c9cf535750da76faafc4af8b5f86b13515ef30765075
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that lead to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic firings suggest this PDF is designed as a link farm to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=wifi+hacking+website PDF link annotation
    • http://darec.sk/files/files/gozuruxanipa.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ece42c68e4---loloboziwa.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/948aad0605f29b9060f2fc0c48e33770/81828991143.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/wefuludotewitos.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/goritisubivu.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210913_49F45C21720EAA14.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/a1cid4dl7v0kt4t846jfht0li8/repedasudemox.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/32961153348.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/37660961261.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/kefitesefavu.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/juzegexexiji.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/82494461410.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b73f93182---67362540163.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/22769479672.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/80994371603.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/fonizugizivexudu.pdfIn PDF document text
    • http://jonme.net/ckupload/files/tosumofotumubux.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/56214188884.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/93478214038.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/58416711106.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/zufewewosekuj.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/48237830974.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/37559949954.pdfIn PDF document text
    • 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_off0000b2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC6 10660 bytes
SHA-256: 38f99aef324c1f9845cc0c6843b91f6b5b357d1dbf15c135b22b15843a81cdf7
font_02_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 16600 bytes
SHA-256: 56b760b73b73eb421a09db4bce6f52293e5285f7b01cd9d9277bf23ca07dbd60