Malicious PDF — malware analysis report

Static analysis result for SHA-256 3877ac571fd29d6e…

MALICIOUS

PDF

93.4 KB Created: 2021-06-26 18:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36098dde073916487f89fe5b012737a1 SHA-1: 90912214732256f21d699e4dca053762c395fece SHA-256: 3877ac571fd29d6e257fd0ee93fa87a5f690bf521364b6ca9b9d0241ef20afa5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/gijexofuvofug.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36dd50bea---87111404174.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3ae6d408---fopavefosire.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/51958906073.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/62967045940.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/90377393500.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/15074278537.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/78c43635696d730f101fdc441c63d683/51397584510.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/917a821491ba4ab97d55f69d42a6561a/6063851585.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6fbb7b7c1---giruruwe.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/pc5dgretm7prbghjlkittdfd76/12513720825.pdfIn PDF document text
    • http://nfc.soo.jp/file/nowenewubu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/h18t6i0kkt9qn5raieedhcqblg/nirefivujudozef.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/18425986204.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/fesikagavi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e03f0ef61e---50828459543.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608777d61dbcf---56947381259.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/xidadoparo.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5ad53bcaf6d0c92da98b630e3fa80d6b/19096149856.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l30cuvcjofo2hkan68vb8ehpk0/nerubuvapufalogizoj.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/28901517917.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b4f701b1b6ffe72a8a584812956db88e/desux.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/87109282411.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/i0de3kmifcpae4qvm2r7a5o3j5/99577285865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hayes+grier+gayPDF 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_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 10020 bytes
SHA-256: c9bced38c585cc25888d7789a42d4d1739e2f128a297cf4dfa07ad688587d3c8
font_01_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 17300 bytes
SHA-256: fb5260586556d3c6f1adad0af43798bf547cd850ff54b4392bb17d74d0214210
font_02_sfnt_off0001507d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1