Malicious PDF — malware analysis report

Static analysis result for SHA-256 537b2a1cae025e26…

MALICIOUS

PDF

85.6 KB Created: 2021-07-20 19:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2facbc957a5221fea28db3470a0124ca SHA-1: eda2f79fdd0bebf2bd179ec57959f99ab1fa6f64 SHA-256: 537b2a1cae025e2669d36fe281477ecb1e21251134cef01a81acbb3f1b7e3038
204 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of an advance-fee scam, using lures related to invoices or prizes. It contains numerous links to external PDF files hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/5c886cf71f432efd116ca4c4bb261e15/43321761466.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/2713a071019677c6a64abcf8092de6b6/53187785149.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/78201368163.pdf
    • http://premsaktidal.in/userfiles/file/nupasofason.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160996b9b58590---tisumemiz.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d2a2b2ec---92805430187.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ce0c438635fc73fe632f97dd5270323f/kivatevakoz.pdf
    • http://alkanboya.com/files/file///92725070355.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/705bf26628cd99711cfeccf2ba746bec/22646392547.pdf
    • http://parkwaywest1974.com/clients/861606/File/41408881698.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ae341776---lafifamavamesurinulilo.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0712e39705---84993616781.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca65dae816---mobatojoxuxeweliwofij.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/wexizifagukigixiwa.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3sk2tsptpceoumd13sqtosa9c3/bizemakimoli.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/69dc078dc7c19a004ae3a6ffba0d5b98/pegig.pdf
    • http://animationcoach.com/userfiles/file/zumoteguvux.pdf
    • http://meble-tk.pl/userfiles/file/pafibovuruvafita.pdf
    • http://sjhrz.com/images/upload/File/99788516373.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuvazuxawovanimoviwiruti.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af86fdd6975---jidon.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3765f16a50---mofetavove.pdf
    • https://asiajitu.com/contents//files/27459002560.pdf
    • https://b2cexpressdemo.com/userfiles/file/pozovujawowesunefurevita.pdf
    • http://agrion.org/upload/fichier/dotisu.pdf
    • http://adamlegal.com/userfiles/file/vivete.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+grievance+in+marathi
    • 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_off0000ec45.bin
1290d95c6b3dc10ab16ab73c2c8591eeedf141142db048b3cb01878bb15d0b84
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 10628 bytes
font_01_sfnt_off0001046c.bin
b61710938796d699d4ccc770c06ae544a99501125f75cbd5086b4ebb09c9c8e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 17144 bytes
font_02_sfnt_off000130d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D8 16792 bytes