Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b23477ab2b79ba1…

MALICIOUS

PDF

82.4 KB Created: 2021-08-16 15:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b4a493414bbabe62d2adc48205e10fb SHA-1: 79e40d4d4886ada7144af71cb35670bcb744ff55 SHA-256: 2b23477ab2b79ba1728c3b1ec08da78b17e743a89838de855ef0f5b7f2c7bbcd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, suggesting a link farm or phishing campaign. The presence of a URL related to 'how to get fortnite aimbot pc free' indicates a lure to attract users. ClamAV detection and ML classification further support its malicious nature, likely serving as a dropper or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://allytemp.ru/uplcv?utm_term=how+to+get+fortnite+aimbot+pc+free PDF link annotation
    • http://debeleven.net/UserFiles/File/24120900752.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5f70e5612---31538777488.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/21569295289.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ca27a2862d5c91a45e30317dfb0b33e9/vaxuzaruvogumu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d82b2818d6---bigodanas.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/nonadugevenafodaz.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/38993971581.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/9128145438.pdfIn PDF document text
    • http://huntland.hu/upload/file/28504348833.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/23436567189.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/ririb.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/56473774145.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc2151e81f---41656366860.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7f41923934e349fec8b324ef347293c0/24199436430.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/72705039338.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/wutawugazuragife.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f4da8bd1ece81e0d4277ea5df049e190/12236918754.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f2d24842759d7367f59ebb38287bd48b/jesivijovufopun.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/lokozujobisumexibovanov.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/roxoguf.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/be019cfdde841368ded4742b1b90c6c1/65799356089.pdfIn PDF document text
    • https://intersat.lv/files/file/1863190302.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/48222376119.pdfIn PDF document text
    • 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_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 10824 bytes
SHA-256: 25baa44e9396d2fbc6d945082b2fcf9f3a0742eb5eaf40face9c7f9deb8e4c7d
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 17524 bytes
SHA-256: 52b831d0f013d863a62331b5aa048b4a3aeed20f5289586762217ffa08902169

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