Malicious PDF — malware analysis report

Static analysis result for SHA-256 51503a20115733f2…

MALICIOUS

PDF

171.2 KB Created: 2021-07-24 01:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 04061bd6e1dad0f1130909f6e8a0ffe2 SHA-1: 5c8e85e5921c6e1f09fd36788b120975807eb426 SHA-256: 51503a20115733f293590b00d6a7fc8c669017bda22c313b9404c6e9248216e1
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 other potentially untrusted hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/367eaa5904ca0129a852e747e3685b69/tijatematavatojezimuxuko.pdf In PDF document text
    • http://angelcabrera.com/FCKfiles/file/72207260947.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/fubufesuke.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/vafejikikupilulorijoju.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/68981594341.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/85cc0t96aiogqkoveeo8bifvum/wazigojezizujiviza.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5d55c6d7495da6644fabc9b5e75888a1/xomadupapidipepotanodo.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/muwulegebunabiduxejasuk.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f2124770be6---51466821722.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/sndddqe4h1verugkg1k3p428gl/3109784755.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/lfcm39lp7q7uor6nooo0u7acpt/38427280035.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e5ec932f5da95111689ea1293237f67/31772629746.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/33571834432.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/uhdi4664lfndahpjlpk4o4kut5/vezejodipebuwerudimoka.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/xiwomozagiremarijeze.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/75718998657.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/jimebuwagapo.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7bbe182b6713dc7ea1774acdb884f64e/ramekofesososasero.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/dodixajuxokagokov.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/91114874957.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/sabawepamimis.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607007c57d765---potozodosexinorelis.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/fadode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=nate+the+great+and+the+phony+clue+quizPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000256ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x256AE 11024 bytes
SHA-256: d69662c2cd7b421119ea1786dd8ef373129b123d64f5fa32abd7a7e4f98e1b18
font_02_sfnt_off00026fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26FB8 17868 bytes
SHA-256: ceeb039e0b534ed1d86dd8fcdaad823d886b59c8b077c26c5abfa6942cad950c

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