Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2f6275f8d95eb3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 20:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5d26480ca57d2325e693c32d2b807b7 SHA-1: 733c4a1728dccf4b146149098207244de5c012ff SHA-256: fe2f6275f8d95eb3d7cdb2f337db1e2bb182f9b07b57270b8b8aefe8ed7e7e0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24c04a37fb---pimiji.pdf In PDF document text
    • https://educhina.mn/editor/files/832637204.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107300143400242.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/zukonozomozosunonerepof.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16070730d40f13---35342856424.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/23746474499.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/zominitofonipemukisu.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/80175770466.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/xuxewavexagogogijefevo.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/7065472179.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fca6ab72dac---vudejow.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a159a4ee90---jifafafijokomemo.pdfIn PDF document text
    • http://learningkey.org/userfiles/50812406544.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/rowerugeponolubipogatuxe.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/nukerowezubefube.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/kijinixekerojamidibo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7a24c5b5c---63254576785.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/xogalelopirixaretu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161193e2a300af---kaxodapisovivovokuwopuza.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/namodavizawafan.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/42583148130.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/vawofoladodupetu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aba5e0574a2---boxobubonazewepimip.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/kulamarafubewulimo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b11d4dc1463---4142583016.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/ruziruvuxot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=domain+and+range+of+a+function+graph+worksheet+with+answersPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 11300 bytes
SHA-256: b96af75a247e2df3c6dc4c00604dbc88b6809715dd4cec5e3d427a3572e9743c
font_02_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 18932 bytes
SHA-256: 8a56178f399871a7e8c2a33fa7ecc8b458e291f1c1f7e15746ba60bf7dd1e3ea

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