Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7f081138f2c78f…

MALICIOUS

PDF

95.9 KB Created: 2021-09-03 06:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 347e61328f12a5117e90c2399a2b6884 SHA-1: d2e84269a198261df1be20bc3168ec2af4779623 SHA-256: 2a7f081138f2c78f4c4705adfe13f37d87f10b31eb1b8acffb7c94552375cc37
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://acrgroup.nl/userfiles/file/87693825176.pdf In PDF document text
    • https://hmanagement.net/userfiles/file/18231660060.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5ac5f5aaqe4tdgkavfpdkgu5dg/zejiniwobujegibev.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/42615415744.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ad230a6218f5090d62dec0a41c9ecfce/27209219579.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087f7909ded9---gezinotutevivomadelul.pdfIn PDF document text
    • http://hangquangauto.com/files/puzozifawewelogelop.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/pigixogiguwawituj.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc931703d4---jovawabotimob.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3e37d27ddd5ccb80b07386c929712ed/pixal.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613099ab72d50---23048140129.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e4bcc9bdcbcefd3b14c65fe1e8560d06/rexegapizukirefibedamufom.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e881432624e0056a16423cb352bfffb/22435610080.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c52abe31e---sevuvoweva.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/zudowovunaraf.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/95878399940.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/palogufekar.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061306305678.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/xavuwuretonepunano.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d57ac7bee519924ca23c2d68a02f20fe/78080233698.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2rp7vi0klbmi0nta8sq8tgttd1/dujakiluluzonitotas.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160edbefd55f35---tijipozuzavenupas.pdfIn PDF document text
    • https://efnnma.org/files/file/78410356014.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/1894049137.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e806b298d6100196c3dc994d8830a4db/33193681436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ballistic+galvanometer+pdf+pptPDF 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_off00010c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 19588 bytes
SHA-256: d9b32d325e2d4a9ae7bd891130da122bf7feebefd42a4b8520d66a7955107f7c
font_01_sfnt_off00013ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15814 11080 bytes
SHA-256: c177ca8fd60adc1166e3dd320dfa10b3f7223c04545b07fea11da1ce8e980737

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