Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf1587468938395…

MALICIOUS

PDF

102.7 KB Created: 2021-07-18 03:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c4d4dccf83c9e6c851cdb8a4184c0557 SHA-1: 3ff1433727f9d4bae8c5ad99d1a62096207e8614 SHA-256: bcf1587468938395d890e29abb1426b494f3baf2125756bcf4b4c41cb5b95b8e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to external sites for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8c30908df550917941e390c999e79f90/fovobelomamajuriz.pdf In PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6809f495831c3892da0ee292bb5b4f10/bamif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba23ac2e285---dosuzo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bc09e188eb51acdc73d3d4fe954fbe63/xilawewewirewasejegamujam.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/dc45a954a42d2faa678d680da1c18d1d/wogugomerubem.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/texozama.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/45930989153.pdfIn PDF document text
    • https://harom.ro/files/file/lelufomawaxokosijub.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/76399920306.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1c1c73912eeaff126a1f414c039db6fb/18680443976.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9i7l90std8bn1j2o05vhsh1kno/gisofatanewurevobodubimin.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/71052736796.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607978351ca0e---78635002479.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/85419677799.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/t8d3846p002kuk08bo7hi4ms8v/82558882345.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/81598483788.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/34356902109.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df28e148b5a---kaloma.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dd372eb30---1706768797.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/93053855596.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lonopazojavipolureku.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609948a5033d6---wibufopiwi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/hcnlieera1hvof695pvt2rro2j/23491711209.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/befunipegekow.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cce830e662---vipimogotunarofire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=boy+baby+name+with+sPDF 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_off000130d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000148eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EB 17424 bytes
SHA-256: c297976c2829b1ce3feeb600572a0a856d4796176259b899ed91800d0a0e9938
font_02_sfnt_off00017578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17578 10620 bytes
SHA-256: f718963e81f93a5212d2cfaeef145b1f35815ee5b65cfa1380cb07e391f917dd