Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0637877d33f057a…

MALICIOUS

PDF

85.3 KB Created: 2021-07-13 03:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dafa13282b8b77e48e55232700076629 SHA-1: da879c579fe5f333c81f5078c3e308b262ebca42 SHA-256: a0637877d33f057a0ef3738c3e0519c5c153eaa13c4d20e554dace493fa2204e
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a malicious advance-fee scam lure, containing language related to lotteries, prizes, and parcel delivery. It also functions as a link farm, directing users to numerous external PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The ML classifier strongly indicated maliciousness, and ClamAV detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://desagresbrts.com/clients/34568/File/lobanolewa.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948e60b933c---63973744881.pdf
    • https://groupunsur2.com/contents//files/93960609125.pdf
    • https://aptitudeclass.com/ckfinder/userfiles/files/40055396315.pdf
    • https://tort-art.ru/userfiles/file/94199508562.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/54ef612c4eee3bfcf6c503297bad2f14/3322590253.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/lteiu75ipib2u1l4f25o3059d1/869901925.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7cc5d2386c98e10589a14c491129877b/55139297657.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff79c3ce09---rekot.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/bff8d23fa283143b16a565361848c307/vitopikug.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079019cc1389---kimosum.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c34b32007---75744736038.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160823d9b3a70b---58113094224.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/rp3t1earftttc1564dqtjebkfj/82428943984.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mt59eavqldverq7i36c8rm0vpm/11135213992.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9881mhkneromfdtumofjjhoa04/44575100177.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6ad5a1ad0ff56dc83dfd8202eda9eaaa/48882789077.pdf
    • http://smartcevent.com/clients/871459/File/juputesatugake.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3577d1d9c---zezalenu.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a1e2a6711bd4d064345bc296d40056fb/44079542983.pdf
    • https://hirurgija.me//files/ziwesorabezolomon.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ae05bc81---notixuzodukamitanegex.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7ac9f84e8872220d1dea57fa06b16c7b/sizetemazogezosojali.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qfn8cdbccpadgihar9ivee5ctl/6072951310.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+sun+does+shine+read+online
    • 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_off0000ecd5.bin
14b480136ccb4303ce60ab91f9a08512b15cac1d492f1f5b1a9ec4366a473d37
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 16984 bytes
font_01_sfnt_off000118f4.bin
52038f1c1c47835fdf336779de619489d78cbf3dd2801d7118498b797df892a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 10312 bytes
font_02_sfnt_off0001300e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1300E 16792 bytes