Malicious PDF — malware analysis report

Static analysis result for SHA-256 863f35f0070f2510…

MALICIOUS

PDF

95.6 KB Created: 2021-08-11 08:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cf7509588f684bb059205be84545f3ec SHA-1: cd492fd3ad85098de901e2c35ff45fb9e8345134 SHA-256: 863f35f0070f2510834a54b8e04df24b642126c68b073b7cf33a4c785a7af755
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm. The embedded URLs are likely intended to redirect users to phishing sites or download further malicious content.

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 http://flyingcarpetclementines.com/userfiles/files/livilifofuseto.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cff7769db---65506245898.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bafv3pkgnb3otgrmdms1dbdo2a/9221513414.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/19439145102.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/41993748171.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/dawugezibujukijega.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/21475dc54dbbbee45a55613f9facb033/72900810086.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/73778651604.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/33537095194.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/91064230868.pdfIn PDF document text
    • http://twilaw.com/files/files/giwejobutigam.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/797c7ef6dfe920ea8ba410620f6ff6ac/14050528193.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a66d8eda8---lekilojev.pdfIn PDF document text
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/23346520471.pdfIn PDF document text
    • http://valeneighbors.com/userimages/vikufikotoz.pdfIn PDF document text
    • https://cecprint.com/images/file/9580721098.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/m7gk4cgkvmjnd2t9ahhkj37ui0/vamutokidujidimirojusika.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723f5db5c24---lijiril.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd3be64f1d---60174555213.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c9a3a06c---29614174526.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a4ca3e000---pixuwij.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/32899118853.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/tabaguzifadakerasuwupina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=cu%C3%A1les+son+los+beneficios+de+tomar+jugo+de+toronja+en+ayunasPDF 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_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 11516 bytes
SHA-256: 5774142d6f688a2607ce352bce1a12987cc9a75659a6dc04ff9362534984a963
font_01_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D50 18388 bytes
SHA-256: b52610d2f9709fb45b7a176ba6bc2b0fdd304f5b02c5ba9dbddd2f0b8f435eb9