Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d1870758516515…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 13:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe5005314ffc6f41fc42c5af8e5fde6b SHA-1: bd9c58f2ba9ac359cf0ec09373c3660623a17ed8 SHA-256: f8d18707585165155c538ec064ecffd37a398fa87077ee77466989c34b9870ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various URLs, many hosted on compromised WordPress sites, under the guise of providing a downloadable resource. The presence of multiple external URIs and link farm heuristics suggests an attempt to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=modeling+and+simulation+book+pdf+download PDF link annotation
    • http://kubabus.cz/novy-web/upload/file/42053372.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5b8162fa---pewiwul.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/fc6aa6b83bae4f9782078cf1b7acafeb/mikerove.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce0e59383---58431869848.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/29336123086.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/71619639286.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071583f01974---xajedirupikud.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/wononewofi.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/48140570512.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/xuvudisomo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607573fc58cf7---wopixezimo.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/8vmva1a3q2h326noc4i968fj3h/99068487221.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/goduki.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/km6jd4qjv7654hg40aaelqn056/vexefop.pdfIn PDF document text
    • http://sinostandards.net/upload/files/72436998289.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/98322795684.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b32acd0a4---nutedejowidemifiduruzi.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/46050133496.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/tarozivi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/mojf6d5kv15ioed41fvm4hkhpv/monovilorudap.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/d1q3ik8q1qtpc55gs6t4bno73v/kudesupixujipudusela.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/pifofixaporutili.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_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 11152 bytes
SHA-256: 0cedd2996884a008741852897ff506e73a31115cefce6216908a708e584d1a9b
font_01_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 17820 bytes
SHA-256: ff3c8a274914a07176a802b34ad75c4a1e00254bb663704bfccf2cec5697efb6

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