Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade33151a57b448d…

MALICIOUS

PDF

84.8 KB Created: 2021-07-04 11:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e8ff379e4b15a2471f11d9016b0b637 SHA-1: a039c48810c0a0b5f8f4dcc7c86aed158e10d117 SHA-256: ade33151a57b448d5f8259f3f0d1b54c3de7169348527b5ef72548413e741da3
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c3dceb86---78071791041.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210602205051.pdf
    • http://agendatourvietnam.com/hinhanh/file/dakakeneriragimirawo.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16082a54e7f2f3---32605202397.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91425c5e1---23465288907.pdf
    • http://bagiez.com/userfiles/file/42587507377.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6b3b0b05cfcaed25dfaa9eaf2dffa28e/18908514938.pdf
    • https://planet-for-events.de/userfiles/file/walusazidagilof.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160741bb519e99---57635883370.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160947c11e8fdb---nawiribotojojawipevasusew.pdf
    • https://pmfegypt.com/userfiles/files/vanuxamigurafole.pdf
    • http://nusratali.com/userfiles/files/11717853822.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/13992657851.pdf
    • http://textingrights.com/userfiles/files/gumufitutimosux.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160880237c0d07---jilitivi.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2a6455080---56235191662.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/8373684745.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920b9a1d58a---10842876454.pdf
    • http://keacg.com/upload/files/60615380541.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02dd1545bc---86985936166.pdf
    • http://adams-gold.ru/archive/image/file/39363149827.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=theatrical+worlds+textbook+pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/kobofujumanawevomereguvaw.pdf
    • 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_off0000e694.bin
5fcf1b71dbf6732cf5f08b2c9896caba7418971d12082a740090ba169bfd1ef0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 17516 bytes
font_01_sfnt_off00011486.bin
b307e0ee68f9161135ad14f9bea69ba8499b8ee321e8621de2aa97362a06bd26
pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 10996 bytes
font_02_sfnt_off00012e17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E17 16792 bytes