Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadf463f917f00d7…

MALICIOUS

PDF

83.9 KB Created: 2021-07-27 17:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79d01ba0d5ea769187c5a10fa412af16 SHA-1: 5945f47ff1f3910199d3076ed392ee968e6aa7fe SHA-256: aadf463f917f00d72d94bcf6895d03bf88aeec2d243b38552c6f61f243ffad38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the presence of external URIs and the nature of the heuristic firings point towards a phishing attack aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfb21c956---fufavumebaxuju.pdf In PDF document text
    • http://zimaletto.com/uploads/file/gogonujesowafes.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/1946583288.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd720bb4a0---talijefosod.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/sivugobu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec72dc580---55118121923.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a50678e6f---deniravebefusakive.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/tepewodelojaloriboke.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/1576433135.pdfIn PDF document text
    • https://photojet.net/userfiles/file/24504811098.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/28b058bb80d5d390e972f98145fcb884/55287831137.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/zotozagerurezusu.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608754eeaefb0---9508498978.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/aojooka1gcvot134odigdibnnu/zizibiladigogitozemag.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/63328833129.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e12c84245281942db76f758c25d4a4e8/42389575753.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3bs3s2dcd4pdip0qc6plt43se2/karosixerinuvowasewurut.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/m0r6ak6ceg7ihtea8m3sjkj6of/tenixipaguladogon.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/009717ecbc3d85b9c6a1e51d8e48fd2e/dimiz.pdfIn PDF document text
    • http://qzgj.cn/upload/file/62897796735.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/rugawu.pdfIn PDF document text
    • https://actorconseil.com/files/file/90893702137.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/makugavisulududowe.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad60297fc---49025794195.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10264e8c---bovuwudovukopibifoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=convertire+testo+pdf+in+word+gratisPDF 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_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 10808 bytes
SHA-256: f1385fa03970738b217b467eb2e72a66351fe279989d78ac643443e7cfb2ef42
font_02_sfnt_off00011561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 17816 bytes
SHA-256: 3d431ea17698ede134e8e1b7cbc6676e41c223d5afc4e823bba4a9f261b8d936