Malicious PDF — malware analysis report

Static analysis result for SHA-256 805aedc1be9e4141…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 22:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d715293f2e16ee7a172d98bdaa249e0 SHA-1: 6c8ca8e0f93cb800b043fc839c4b0e514fcc1cc0 SHA-256: 805aedc1be9e4141f2d7c91a85f87ae977c8f78a5096d11bb9356e02b4f33f81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to lure users into downloading further malicious content or divulging sensitive information. The presence of multiple external URIs and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=time+period+formula+in+terms+of+omega PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/69e0e9bc3af0e0f62cc587de2c2b0da6/14721742537.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/430a470ee483e1d1c7ba9c8f2644ee45/83442787918.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2008de54---xitebefifolabiwose.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/dedotalejuwixomagitowixi.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776bc6da78b---savowen.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097a94f0d614---91763044365.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/totoxetaso.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/zexudajubavukejikin.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/01bd8867e1b29c577fbaab3a60306620/62433309544.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/4577401867.pdfIn PDF document text
    • http://allasclub.com/campannas/file/33989558567.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/rotozujewanad.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/bidatusowufaf.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/28532188768.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74af500230---51753920229.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/74076597999.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rugerusevaxilarupodiluk.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/wotirosusi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b49a1e022c---65870015670.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/punapuxugofuxikuduwetupas.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/616d6cfbb9756cae06f14359a1ad762b/83769855003.pdfIn PDF document text
    • http://teifsepahan.com/files/file/tiximiretifalopavib.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/namisaripomap.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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 19280 bytes
SHA-256: 7d3b5be5e90fcdabf52ec7c56766a7b902153aa9f7c8173a209a4c7ec24101a8
font_01_sfnt_off000115fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E15 10904 bytes
SHA-256: 315cef93e142e277d3a35e6b91204acf3b8e1772f47acd5b964337c0241a89b3

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