Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f22cdaa13285351…

MALICIOUS

PDF

90.9 KB Created: 2021-07-04 11:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c6705b42a4a10ade60e230ff1104c63 SHA-1: 92fa1fc5e62905b3b56db666c3aed44420821e15 SHA-256: 9f22cdaa132853511589bb7d94dbd3eac31f4999f94e9b69dfc86cfb5db0b7f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which appear to be compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The presence of external URIs and a link farm indicates a phishing or credential harvesting attempt, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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 http://sungsam.net/userData/board/file/worexig.pdf In PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/fudumukolasabajujor.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/54906627310.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9538e457f4---51816298234.pdfIn PDF document text
    • http://ud2-140.com/files/teramizatev.pdfIn PDF document text
    • https://mytopics.it/uploads/file/91325856625.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/8e73b31db209f5d4205370e0ba07e9af/45687407551.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nanepifoxizazizid.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a1404d60a95---zewevi.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/lisaraliven.pdfIn PDF document text
    • http://placc.info/up_image/51868779896.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/cc10450b4526b22e9d5b0f80b7b09499/kisoterodexevebimo.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b9dbb8f3---78900966104.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0352f13cb---92884504564.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/xagatarupigazewogidekaj.pdfIn PDF document text
    • http://kotolantopeni.cz/file/34096602146.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad340e470ee---4775671792.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/zumugo.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4b66769f550d008abf8c318718e64143/87328500719.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/ritezatarobupiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=have+a+good+day+removalsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 10468 bytes
SHA-256: 5787153e8ce82909b85b999ff3b11c74cacdbacab124bc279455e90ae6f0c699
font_01_sfnt_off00011a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0D 17108 bytes
SHA-256: 2c899231f915111adec82e5cb8b0a1e23dd7429a9ce56903c2781a498c4505f9
font_02_sfnt_off000146d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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