Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15cf11fea71659c…

MALICIOUS

PDF

106.2 KB Created: 2021-08-17 17:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 33e9d2e6026b9525ed43cab220261a51 SHA-1: 345e4173f53a5bf2e78ab287ad613cab165a1b08 SHA-256: a15cf11fea71659cbd9bf5c2c83cbe38a446d92c5feb8602a52b513417415e45
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by a ML classifier and ClamAV, and exhibits characteristics of a payment redirection lure. It contains numerous external links, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 https://meesens.be/KrMee/Tekstverwerker/xiwaxoxesexolupobumobimi.pdf In PDF document text
    • http://orchid-daikanyama.com/userfiles/file/8950181353.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/67606401464.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/43292870420.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xakovuwusojuvazuwolet.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/57586403821.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/84759523479.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f86404c9b48---73644687177.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/demimabajuxalakoguberubi.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/vuxotawajalomofutefobubap.pdfIn PDF document text
    • http://www.asslar.de/downloads/78258288388.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8f9858cd479789b082a1a7142c1be8e4/44270252915.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2c3f28b3440e116b5bad52e3798f06a6/bofivav.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/27337612915.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/91676713139.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/gajewizopezup.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/19834417410.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/7kjri5i7q3qa9ddd5dgg5glbfm/zosaparusun.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/80a9fa0d507abfcc6e3eea9a508dcd18/wewozuv.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/16dc74f794674659872334c038021f6e/fonekawofipupezer.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/pexirilojonagasomil.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/lerisevewogirivosofu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a06194847f19895ce1026576ecf88048/96685061128.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0538ebc12---49517241407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+crystals+hypixel+skyblockPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 18872 bytes
SHA-256: 43e50558fe978bcc937310e5cc426b5a6ec352030a3994aa5fb4c47d5de75903
font_01_sfnt_off00013621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13621 17500 bytes
SHA-256: 113b5e99bcec91d71a0d30748ca2f1a7e7b6b09f64394768fa5d4db2eda43141
font_02_sfnt_off000150df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DF 11076 bytes
SHA-256: d5d0e1ce985c31b56f122f34f4763f2d586875a656fb23e649a97e4b34751948
font_03_sfnt_off00016aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA0 6420 bytes
SHA-256: 2337ea833ee95c9433eba6bffe346919988aeb64e6d4e7f0bee3a05da2c7cc5e
font_04_sfnt_off0001808e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1808E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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