Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68c4faadfaaa939…

MALICIOUS

PDF

73.5 KB Created: 2021-09-15 16:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6e220b275a75fa57a19135eeafe99b7 SHA-1: c116664b71d56f418c1f42b6f66aa16f754e7b4c SHA-256: a68c4faadfaaa93971d55dc2de6232e5b2a028493a9d2acdf7688792a5e5ff8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=how+to+display+data+in+table+format+in+android+from+database PDF link annotation
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bd669333d2d6d53766b7f80f8ffea47a/20821879050.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/85555502799.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/92737774391.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/14779048680.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/62422211091.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/dakafifasifetalobowidimez.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/mozabetubedufuvirukolox.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff9e5cceaf---46763562313.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0dc7f1b77---51409765800.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/lawalugotakurunaderilade.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1cd727d6---28460927028.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631348021.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/36314262188.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://easyhypermarket.com/userfiles/file/5255209703.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/jitogimerudabujop.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/voxedumisisivotef.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/56241699737.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/6995664901.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/lobedodotokoxekasaxomim.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/delavone.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331ab306366---tolojojubegikuxigew.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_off0000b8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DC 17280 bytes
SHA-256: 81e0f4b4aa9e12baacb191f8cef2b2b26ba5615cbefa967219a3164504875d39
font_01_sfnt_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 10988 bytes
SHA-256: d8440f3d1acf9b259eda60ddb7bec6bdc18a5e01ae909fe020c107e142c51f49
font_02_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1