Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9da074cd32376b5…

MALICIOUS

PDF

78.4 KB Created: 2021-07-08 08:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93e74d4e153be443a0091b5e1cfe5028 SHA-1: c0889814ede9c93d7280e04b1e3914d667d36ae7 SHA-256: f9da074cd32376b527a240e84df6693d8db7b360ea9da2793bb3eb96bc667216
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the primary attack pattern involves luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://alatheir.com/atheirwsfiles/file/10674524776.pdf In PDF document text
    • http://bularz-auto.pl/images/userfiles/file/94706484015.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5df61bdd---bijojelufo.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/zolifilope.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/59442712323.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d6fce23ec---gulotabot.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d761113431---75806534321.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bec8780d1cc---sokudifakijagosupaxovot.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/6a1118c359bd52ad0486251c7e3102a8/63895738622.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/82094364087.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/56126216831.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3ec3c353ed75e95ae1f03c0f869eeafe/85379623771.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ifflr8dslg9qgqf93atla5kps1/29078175407.pdfIn PDF document text
    • https://naoshima-habitant.com/wevuzopifo.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/87421880972.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/105628f25a83031b37f8198095640cb8/zeduma.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/kavasujamari.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/f4d1fa5c111f8897db7b14d094f02bd8/pudavafojekaxizenazut.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c768f310e1e897ea09cec864e3fdb56d/30952120644.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/jemozefukomugada.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/jetubezu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/sumizefulasu.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c181da91b9---93434861393.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/77489a9076424932bbebe0bd6b50b21a/gepefunedogujawedewikakus.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8f13271f---78426865901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sort+list+with+comparator+javaPDF 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_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 16412 bytes
SHA-256: 3ff01d0835164d111a65120c96b12f7424f23f2aaf89097fce913c253b00af66
font_02_sfnt_off00011329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 10760 bytes
SHA-256: 43684d14c7a3cb8123e3041bcb820fef5de532433bbe5152e40ff9f079cdff27

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