Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f87cbccee59024c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 08:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8c7458fbab8f5fd931e3d16a1928111 SHA-1: 96e6af2a396835f813385c08091b4fa3b7b3aba5 SHA-256: 2f87cbccee59024ca317648d88a3c22f5bea32b0208245082fa5a1b4dd799e88
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the true destination. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick the user into calling a malicious phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://divyabodhanam.org/userfiles/file/gigivomava.pdf In PDF document text
    • http://gruppocaminiti.it/userfiles/files/sumulabaruni.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210902/file/26179430592.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/kuwemovetijopudububixa.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/riwubefinujewilesisez.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/32112789524.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/688snbpn6h3j3vcppnahv6hcod/54837267168.pdfIn PDF document text
    • http://mlight.cz/archiv/file/2261087942.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5d60b018b9f4bea05a140cd14ce6e182/15628445390.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210914_453290BC7ACF656F.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/29183305270.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354bca4835b---liripaxu.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/51919189377.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/sojupejekepaxoxanibirulab.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/85646948545.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210913_A461A19351A0C47D.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/pogukevama.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/suvepiwuw.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a4efbe793673b592d63119e8c7bfc021/51024796820.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b3c48557d33b9a642d1a0ced36d6ab30/94193878629.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/bivisariwexowukufojuzezo.pdfIn PDF document text
    • https://ip-pharma.net/data/files/liwilumefonagasotavatadeb.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf157bfb59---nodisusaleler.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/sajodudororolav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=enable+chat+headsPDF 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_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 17812 bytes
SHA-256: 6ad3efa870194abb1f676180aa57fd24f1d10bbe632f7b134ccfe37ea0683f3a
font_01_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 10276 bytes
SHA-256: 8783e30359215572cce4cf73e73c2bef3cf4c524646acf020c6fe144baf7d889

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