Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f5620eb5861e1f…

MALICIOUS

PDF

132.2 KB Created: 2021-06-29 21:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8d0386302974e5ecf54d3ed36a3bafea SHA-1: bcacd2255b1aaa28a1ef14f83107f488d9b05dcd SHA-256: 11f5620eb5861e1f096c01bbe0118f9d0846389ed3c943c1ba3c4925a4d7b919
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=collectivization+of+agriculture PDF link annotation
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607686c493fff---43293921555.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d11212faf1d57a194581723b40d101cf/73032983153.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/48315579299.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a4e7d2f03---zebezutuganupanulumogevow.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/68436202017.pdfIn PDF document text
    • http://ashioke.com/images/library/File/tulavokubetogukaduxir.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/89025587647.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/ziwofakuwinabubaburizogux.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/7725986056.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f105b0f985---mudabajufugevikegemupix.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/78231805902.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b36cb0bcc8---97589459726.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/jekimozuvaxa.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/hg3eunvtis3cot1oh0pcmimi27/wijel.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/79faa1b1b5a4930f3da094e9e9b19ecf/ririp.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/64272568703.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1cd28ebbb---50572715881.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c162f61953c---talawopas.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b28695050---51751151902.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/p83npk3pn21gl3cprvdcpc5cnq/lovitujuw.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2b8e868c3---puwebafujekakadoliba.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/sogizemipexe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001972e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1972E 10600 bytes
SHA-256: 17a05825a3b1555c73403d13a4f14e7179e17a12fa863001a962dda956043a1c
font_01_sfnt_off0001af9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF9F 24252 bytes
SHA-256: e19afb5849806144e414ea991c13745e6166e25f9b039b177b60770bb6ef9cab
font_02_sfnt_off0001eb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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