Malicious PDF — malware analysis report

Static analysis result for SHA-256 328fc85168ddc5f2…

MALICIOUS

PDF

175.7 KB Created: 2021-07-13 15:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7bc66610217333237e7debe97895b8f2 SHA-1: 68e866093ed211babb9392174be0fc2c7e9fdc35 SHA-256: 328fc85168ddc5f24d7c3f5141b6de0e0317877d4c92e8b69c37241c977b7491
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous external URIs and link farm patterns, indicating it is designed to redirect users to potentially malicious content on compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=a+new+deal+fights+the+depression+guided+reading+answers PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160713f9bb65ac---pakin.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/983c4de8ee09f5546513fd884a63d1f1/lidezegowuturemufobasigaf.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ad5ee8ce39dd73330bd7af29bd572980/verege.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cebe6720bf---87723152086.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/fajakorosif.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160858481a7040---fixobaxufafigejaji.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966c099bb19---15631667874.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/p88gnam4ihogt5iej7i68ssfv8/gukatekizijegodudurozu.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/26185850089.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/645234ecf353424302932d8de3180cfd/gilujufaxeguxigeg.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6416634737---kunidebuwi.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7722336a799478741dac366c9e4d5560/21505049066.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/jidodupak.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b06cebb43a3---dorawomojo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a6836932679147e82a75c08bfdca367d/82889141221.pdfIn PDF document text
    • http://coffee33.ru/archive/file/lisiluvu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608673264c92b---siwavalipekotoxexonibi.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/riwinetoti.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/muwube.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a1db3eef---komafejamezifari.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ae6e62571b8959efdd5e105f96ef91b1/48334046810.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/83e28f2cac2cb2c14cc2589ec53cd8a3/gimajiwonuweteximez.pdfIn PDF document text
    • https://majubesar.net/contents//files/30340874449.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd9c11a94---11870051333.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_off00024ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24AE1 19380 bytes
SHA-256: 915b7b1ba177e46112fff041bc635e3cd2c96fde35cab193bff99b11ade4c853
font_01_sfnt_off00027d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D85 10944 bytes
SHA-256: 16560ec04597228867e00da3d3f40857e6a1d39fc7b7ad40beb6dc1750115023
font_02_sfnt_off000296b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x296B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1