Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f7ede2a5872e25…

MALICIOUS

PDF

99.9 KB Created: 2021-06-28 03:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c2c003d65a0fedb8e58d3a227f6a97cf SHA-1: 98d93808840f75c94ab63121647b3cd36f91111d SHA-256: 40f7ede2a5872e2592ef3b6466974582407506bf68e4498a852bab2cb1393fc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=qualifiers+in+writing PDF link annotation
    • http://tfh-filter.hu/_user/file/78307825353.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c969d0650---5356374397.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa163642948---loremiv.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/21162192627.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/b050b78aace613bb3d341102cd1f96a4/81544904795.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bf81f7ab55d---53702230189.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8832e0cb19bb28eb8a89ed9c37ca2381/ruxanazitibezoda.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/90232634450.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c06401d08e2---vumonozurubi.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/dbfebee3afce87fd3323544c5387eb1f/96102850564.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/42992909305.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b366ede04---rifapajaboluxakorogiwolu.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/68281512971.pdfIn PDF document text
    • https://efnnma.org/files/file/gosimino.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefb96fc53---59189803297.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/kidebebetuzizuzefojuroris.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/biruwuxekosakog.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/gewexirik.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/60c4tn8tditmr4oq8k8jm9ivfd/47134573981.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607230250c4fd---xezegowumedesipe.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/vosuwurax.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160819bf460eb3---59772007243.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0db8f67edb---27507314033.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5t3ds53jkgkt457falrvmiu9h1/10693040678.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bac4c9edd---55387128142.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/waforofojizosudatawivo.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_off00012972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12972 15804 bytes
SHA-256: e48d92eac00577f4250b608485c444cb47beb67c8b92ead802e979d3a05e5de8
font_01_sfnt_off0001521a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A31 10512 bytes
SHA-256: f825c5d97f69a4efdd8cf47782baf0466208cfcfe81a391766cf435fef46ca27