Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1653fe07d196ea0…

MALICIOUS

PDF

104.1 KB Created: 2021-08-22 01:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3b6ec68b6d8a6a732afbd2e9cd6d6b6 SHA-1: 07887ea75a53b19c5ec1629947a9857f2321377b SHA-256: f1653fe07d196ea0a7bb936410048b0cbd331f6b85c8ae8a8f7d42566db61845
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://garglob.ru/uplcv?utm_term=realidades+2+capitulo+4a+page+137+answers PDF link annotation
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/limijepawazabi.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107080728269890.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/11140600232.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607697bed5d2b---15908311688.pdfIn PDF document text
    • http://bptramptour.pl/files/file/68003484307.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8d1d32630bfaca0962bbe0f0ee83e6e5/jakunivakulifujur.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/85172663082.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082a229925a5---71905648586.pdfIn PDF document text
    • http://samtle.net/ckupload/files/34699518881.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5350c6135a---bizoviro.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/xuvibawet.pdfIn PDF document text
    • http://nothingelsematters.net/pharma/images/files/69245199807.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/wutud.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/radomamidawomirejasir.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/edd1c3f6a12e1692d6ad0e60c9724939/lexejejewukagob.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/79d456ad6eb9a5b79302ea7493785198/roteferuwosurafowi.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaaf7c8c74---ganepuxakosodovoxexizaz.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/48337693596.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c2cbbf62fa2---30602413830.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/47702819289.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/dubewi.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_off00012f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 11392 bytes
SHA-256: 4100a64fed778c8aa96d3277f9078737e2f154e6c4740195543ee2f589020d35
font_01_sfnt_off00014a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A60 18648 bytes
SHA-256: 75a32469b8f04f094369af7df505ca6968e699842fc2c9125294896f40de8550
font_02_sfnt_off00017a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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