Malicious PDF — malware analysis report

Static analysis result for SHA-256 266c1a9f29854023…

MALICIOUS

PDF

97.4 KB Created: 2021-07-06 02:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be5d036015755c6e68a08ad3c71db2dc SHA-1: 812e3763ea0085a542562d7c8263e69ca0675c8e SHA-256: 266c1a9f29854023ff013ddf760aa866aa909ecd4ee913ba1108b890eea805c9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e158e032b---ramejewos.pdf
    • http://reguitti-engineering.it/userfiles/files/tutebuxuj.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/6g3irsgouonr73mnkmchg30584/nitosejilonoduledidipinu.pdf
    • https://abe-rdc.com/userfiles/file/wamemisutefarojelufuwejis.pdf
    • https://music-group-store.com/upload/files/mivimebe.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7bd438c798493e9d5f9d13aca80bf8ea/44878209663.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3dcdf389---vuxoloruveboro.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/c3d10bf1ab871e9de02db918fd8b303a/92831059197.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/53523629927.pdf
    • http://provia-events.de/pics/fotos/1/file/dugonopinune.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9837e715e7---motomar.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c01616ac9a4---senodefuginojoluloridod.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/0lhh6p6v34qbokn0tkpga030t7/53841857777.pdf
    • http://pileshoppen.dk/userfiles/file/13228846497.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f5da6c014ed93cfb64b34524f087238/10459715503.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607419ae5a263---40461056768.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b1120c991dc98b62868c473818f6785a/mopuvotagiwud.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dedeeb523a---vuzikapuliw.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160761109ac706---rirevifi.pdf
    • http://tuning-zone.eu/userfiles/file/48700214263.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/98712b043d9ae6d97768eb72cd1297d3/63051816427.pdf
    • https://motelandratecuci.ro/userfiles/file/33764110822.pdf
    • https://wodepcb.cn/uploadfiles/files/povesaxixepasanuwe.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3245f92c7a---xavidepexejajepazubidiki.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/f96a0dg3os5veumnbo1bd5oi9b/zajevavuxosagikurawedukov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=my+wife+is+not+intimate+with+me+anymore
    • 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_off00011e62.bin
9f555baeaaff68ed61c039c3b0a4faff20fda2fcb94d499cd193a84bd5665ef5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E62 16268 bytes
font_01_sfnt_off000147e9.bin
a3cbad26099d035c0c23a7c4da3c9bc0102850c59863eac1b6b6f33d07091ade
pdf-font-stream PDF embedded font (sfnt) at offset 0x147E9 10628 bytes
font_02_sfnt_off00016020.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16020 16792 bytes