Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06d27c5966a30df…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 05:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 511b07d98b1524b4cf82452a734aaf11 SHA-1: a13a2aad0fd3427304aab5ab27c76cfd4fcb8c04 SHA-256: d06d27c5966a30df860a36ba5253f15c74ad712d44189f6949fdc0f84cbd2cba
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded URIs suggest an attempt to exploit user trust by presenting a seemingly legitimate document that leads to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://viettelhaiphong.me/data/dulieu/files/79991998164.pdf In PDF document text
    • http://kxqcgs.net/filespath/files/20210902223716.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/vowewojebepunigidatit.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea4a3d92bf---9181370967.pdfIn PDF document text
    • http://agilesolutions.in/uploads/98072903611.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca6ad1165---96850784312.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/bixodepisomabenog.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/93621062688.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/fisizapomagunifupoguza.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/21163821824.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136781d48815---fofefapufaboroj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b04956b5c---xinufam.pdfIn PDF document text
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/38018793682.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/57tej36grjrgeuvh95n94hql12/rovimoxokuvomukufazubuxo.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109161223191297.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210911032215.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/78702240760.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kqof82p7n1uhje204nutkv74um/38649501104.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/lilobe.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/38360041388.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109140707161346.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/32563737751.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/zerevev.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/16907334394.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe9eb8f97---97819625783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=jet+car+stunts+3PDF 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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 16608 bytes
SHA-256: 72e6cce5c0d2791866d39cb5e04a210697ef41d1770336462386faa9dc13d0ef
font_01_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 10228 bytes
SHA-256: 44e5d3c32f89713251009cf61b0651447cddf93fe1b49461fbc373c7a273e44a

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