Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03c39d401761f24…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 02:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 367aeb86dc4be04346504fb2b1ab478f SHA-1: e4b364b68f91ba4ffa08702e35252c61fe931bd8 SHA-256: a03c39d401761f242d76de18fcbef9a70c7897fc16a6b364224d79a2ce96dc4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for malware distribution or credential harvesting. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://smidgel.ru/uplcv?utm_term=mental+retardation+pdf+nimh PDF link annotation
    • http://ciskmv.com/css/file/14152114145.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/zetavesosirimopefavad.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/bkgqaii9jgc95a6h8v1eg66e8k/ruvowowotobogogaru.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/40935708553.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/v9h25veop44mmjv0j9vepdbh4b/52357352975.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0f99147d---kirizasufilidujesazo.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/mijomubale.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/99554231173.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/xilewiwirulapebif.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/xiwuvosotusuv.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/20170728884.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///2986095666.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rbc7m7ej7iqun0phens44vf5np/tewirulag.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160955358480d8---46675595863.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/16505972851.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/86guqki5j7anapgcuecf8uf427/31761091578.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/musumowetufenidonogegop.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160723bca50b6d---52889669479.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cf04a2c26---33261046294.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/danubukeboxuke.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/93967742918.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0b14df0fd31b2065a4936d666d8df022/biverijafaxegogexotakilu.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/52920683307.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbc0b6fb63---63088001501.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/72720871904.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_off0000cc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9F 10588 bytes
SHA-256: 82ab5a83fc008e0a5342065c48edf9e63daf017ea8bbb69257c23224c2981621
font_01_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 16808 bytes
SHA-256: 0499c7d03cca4082f69c4698a557d99a9e6b141529c2a952276af6617fcb0c9a

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