Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60b25b38f933844…

MALICIOUS

PDF

86.5 KB Created: 2021-08-16 14:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b32ecb8f733fd380827ef3549cfe2b6d SHA-1: 790638e29e50d82ead3bef81d7b41a0850cde5f0 SHA-256: a60b25b38f933844a77b6c0ffc7e89d127fee505523c40a1fc1f7fe87c7ad2d6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. It contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, designed to trick users into downloading further malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://daedukgs.com/admin/fckeditor/data/file/20210708114654.pdf In PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/3140645551.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7881c31032---66923427219.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kmob439amegkhgq8sjngtc0u08/61714734505.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/gazalatalawewusakaned.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qh1haabppv95dkbabj4n0qi2ju/kejididi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608135fbaf17f---30578443238.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/fowilaruvomenagekesosudi.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/boloj.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/tirfdi4debvarpv2blblf0ckn1/90436946317.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/14426637913.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/57217392294.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/67233290045.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/disotegamozibapuwisipax.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d61815ab90---bazezebuvitesevewini.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a350bf212c---xesew.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a87179dc064---rigutanazinebexesom.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/wafazuwufapefedotupojut.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d91ccd276e1---60726957215.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f871775848---8339746483.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/97541401356.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/e7240abe79841cf75517e4fef8c4272d/70010138568.pdfIn PDF document text
    • https://agatanorek.com/files/file/23255241130.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/34618215950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=prayer+to+break+free+from+generational+cursesPDF 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_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 16560 bytes
SHA-256: f1b8217b18fbfca75294ae01ac0d3aab6b6bb18d101d8de9b230e6d506c85291
font_01_sfnt_off000117a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A3 11128 bytes
SHA-256: 72cef654346b1a5fffc326f10492fcb4d616f7f6a08e9308ace87de953c7353d
font_02_sfnt_off000131a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1