Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdef3fdd09a81b2f…

MALICIOUS

PDF

110.8 KB Created: 2021-07-19 17:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e95f6b1487fdb683a05534ea21cfccc SHA-1: d8fb8c0c734a4b3df0c9c42391180f03cf7f6714 SHA-256: bdef3fdd09a81b2f7fa99687dceb1072f4e243f53310a9331be6a2096b9e5bee
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of a raw IP address in one of the URIs further suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/45v7irv7vn88pk8n39ggck6scr/kurikukipoketijuda.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83044afbe0---24404480274.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i0siqpoejjnqlsqe4a0f56i73p/raxebupu.pdf
    • https://mamo-tato.ro/userfiles/file/gewajudaguvakeleridejune.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/rivesapola.pdf
    • http://daydreamspin.com/userfiles/file/69943937428.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be58c3efefe---fogawuse.pdf
    • https://grupo-kayros.com/userfiles/file/36162897378.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/64464751869.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/818a103914242cf706cf60ac88ee1bd1/vudogunusuj.pdf
    • https://whitesal.com/data/images/file/8096_20210518215717.pdf
    • https://aarhuskortet.dk/images/file/8962726447.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29a840d89---pevedisusoginifagomexeg.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/j8anp1qtf1ofrgqiadgqgeekud/2925148513.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b346b0bb6b97cf29eb1ff23111f1cc25/13145278404.pdf
    • http://hum-lucknow.org/test/fckeditor/file/letiboxezoxisa.pdf
    • http://bakoca.hu/files/file/47183514793.pdf
    • http://www.salpasafarit.fi/tiedostot/files/47430282170.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dcf98714b---47449894849.pdf
    • http://barbusci.it/maisUserFile/file/28215221282.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/ef1c99224eadb49aa4ebc932b79d6427/53708611972.pdf
    • http://spamsmsgiare.com/media/ftp/file/jejenujimudijuguz.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67bbea5417---reruwowotuzaxaboviluki.pdf
    • http://thevelascofamily.com/clients/11614/File/pimuve.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=chemical+equation+predictor
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014e69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E69 16792 bytes
font_01_sfnt_off00016680.bin
dc5bf329f12e8dcb01daa2f6abdcd47b9189995e1030200049a2ee4f67f1d7a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x16680 10888 bytes
font_02_sfnt_off00017f3b.bin
638b07b022306fbea5a7c64f1ae4ad518615c43df25aaba988962f5673ec59d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x17F3B 17880 bytes