Malicious PDF — malware analysis report

Static analysis result for SHA-256 e725bb871947b957…

MALICIOUS

PDF

98.0 KB Created: 2021-07-23 15:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 912d6d16063e79f41b0a8d98ecdf6484 SHA-1: 51abe7e3c92ec461ab515c5fd846efbbcc49e85f SHA-256: e725bb871947b9579e85ffdfe2b89acd6f04697bcb53ddeaa3b35d6a74ac8dbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious or phishing content, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776b87cb7e3---33150740446.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6lnufe98g2uuhm4ni3md9hn18a/91720753419.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/563li4t4qceoe2uccdtdeed5c1/57231932548.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/33901235999.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/51505540455.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b964a1392ad---noralolupu.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/50065650792.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093a22b175ae---41578345594.pdfIn PDF document text
    • http://szpk.hu/_user/file/28147712075.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/i83vpmd4cunj8toig8v4fq9i57/wozilusatobepidinota.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/rudupetuxowagigabuja.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/4bb8c141eaf4ea4bd3ee14cf8c39a115/63785765661.pdfIn PDF document text
    • https://latework.cz/soubory/13472363181.pdfIn PDF document text
    • http://chamdure.com/DATA/files/87000339269.pdfIn PDF document text
    • http://lulanjina.net/upload/files/88567817794.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/95050947026.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/zadaguxitidizozesabot.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/46860332803.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/fageragabugaveje.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2f64218987e8a3e2e16ace1519eb8b21/zixaguwadibeja.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/07a25s2manv7e69sc9nlbbaht4/jajawitogujanemubipi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608844877dffb---bisaludowakinolumamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=factors+affecting+enzyme+activity+lab+resultsPDF 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_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 17892 bytes
SHA-256: 23cac9d00f4ee6901e463c499eb3a3b5f991cdb7f97a43d35c2cdd08ac75e30a
font_02_sfnt_off00015ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC7 11136 bytes
SHA-256: b4342dc44d261a8621ca8ca58da1d8bca02c6c521445396cd33e5f6349a6722c

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