Malicious PDF — malware analysis report

Static analysis result for SHA-256 9112b5ff040fb999…

MALICIOUS

PDF

93.7 KB Created: 2021-07-30 05:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f8115cdd8bf3f056a3300389784b64d SHA-1: 3550c32cf41482d99d24fb66e1863969295743ea SHA-256: 9112b5ff040fb999ea2d2f4dc163edfa9d61f5bf9fd6efd3db55350761b9dfa9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by the ML classifier with high confidence. It contains numerous links to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of a 'download button' heuristic further supports a malicious intent to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c4446d8afe6e2ad95cc8a4c69c1fd9dd/94557514328.pdf
    • http://ciaooo.ru/uploades/userfiles/file/86307636648.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/9aictu4sdiqgbf2ocegq91v5e0/tozidexilakumifojuperesu.pdf
    • http://brucemaymemorialgolftournament.com/clients/d/d2/d245e0393a5bbb16d67b82808c007790/File/72640002196.pdf
    • https://hiroyoung.com/data/files/3289218685.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/fe61dd7844e1cab95fe84d304964dcc1/dakulobinagopusu.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb46808e44---gamafilibiv.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/f4b95e813784dc5f17ff0ca43aea8263/kuriro.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbdc8c3325---3366710445.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/dncl2fabr17guduj4176hdkbg5/dulolovudetopafakubukaxur.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ad051989---58897269798.pdf
    • http://kzlo.pl/fotki/fotki/file/fofukiwir.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c4aeb79bb1190a6a7702735a0fc9e528/12456938328.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083df8dcc2c9---tawelidimulalepevuda.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ee35888be3a---roxolijibajax.pdf
    • http://keyflounge.nl/userfiles/file/xivevirinoxubifovezef.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ca20cee7b---68629368432.pdf
    • http://www.allatpatikapecs.hu/images/file/96894570598.pdf
    • https://editionsitaliques.com/userfiles/file/94341295070.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0d51263c---36193130262.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/fb050894d41410099fe44528285718b4/21480297095.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9v81iva1ora1jvt5ti2il9k2i1/bibejiwonanobagosanebez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=clash+of+clans+hack+pc+2020
    • 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_off00010751.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 16792 bytes
font_01_sfnt_off00011f63.bin
56435baa9a78cc505d31c3b8d3939db3dfd361bc8848ed517005883f9123cd23
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 19824 bytes
font_02_sfnt_off0001512a.bin
24901baeb68544591422abd99479513b55011f7baa3b309a45c778affebb2fac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1512A 10520 bytes