Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b41b6e3e1185ef5…

MALICIOUS

PDF

85.9 KB Created: 2021-08-11 05:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 329312b44f2f525e057577bbced227a9 SHA-1: 70e82086f891ceb57da90632ff34b9034e9eae2d SHA-256: 7b41b6e3e1185ef5bf16c48fb0d1e0e38333c074ef93fad26a8b38200a13d4ac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=tabla+de+calibres+de+cables+y+amperaje+condumex+pdf PDF link annotation
    • https://mingyi-lock.com/data/file/userfiles/files/puvutagawabipexawepifixo.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/47489740428.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/4he8sa819ttljv2hqcv01aaovd/fikadeb.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/48651194059.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a8e162e39---fenotetodezajalije.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b67c7b4ee3a---41014325315.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607267f610b33---6544221277.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/roj315intgl4fs89jgb9hsu1dk/2089873989.pdfIn PDF document text
    • http://ahchala.com/img/file/33256622224.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/97610524722.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adeb51b9d6e---23719059342.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c36004bf---97227065190.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c92198cfc2e---gojofax.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e3e1427f6---23942201064.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/68481597285.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/45416673846.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/texovixe.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/ropuled.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/og5l1i8g3a0slq33j14lke57bm/vuxixixonoliliwotoxap.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/14984318225.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/qe51hfq7ulhaqm72kcl0es47ch/rinubejetowezipadube.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/66967025405.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/51521513797.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160885ccc7c8a1---neteletakalixu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 11232 bytes
SHA-256: 7b627013a9fd434f01c3a2c778591647e9d4674347c146ea01e09aa8574f565d
font_01_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 18172 bytes
SHA-256: 4b733b01067dcae4be10871e5e47a149814ec6db982134d664011304f3d54ff9