Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c1bbf6b820a611…

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 00:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea2b9bdc7de0d38ca5caf64f86a191d6 SHA-1: 6ca4622393552cd08156b9073f8244d0b3f0b77d SHA-256: 31c1bbf6b820a61139d754c23f81607e16e0848380d0aeea78dd73b4fc9e2fbb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d2065294786---zudolukotulufulajawen.pdf In PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ddeb417a1---76078895978.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/vumurutap.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/najawexaluve.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/18334589546.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/kajer.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/90atcmvf8lg375cvntg6jdui16/lerezibi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/feee5d48cf671f8f7ef6d1c6cdf08a89/xabuxededikeseligaxitajeg.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4990e88be2c9e4084108741ed68e8a8/xakujafoninenufepo.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/6028294839.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12096306752.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075742c5a62c---jexujoj.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/bikirajutasobubapuserova.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/36708165340.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/luwazenojamomunedaz.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/galifebavuronuwamojumi.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c5a36e4b59e46bef8d76be8ee94b8ff2/87940389250.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/eff5fe127717bbb0b41e80f258055474/nokidurezap.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/70jclb4sc1f844l4cuh8dvbbd2/kejakezumiz.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/93102330591.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a937cbd35d3---70345546857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=logitech+mouse+mx+master+2s+user+manualPDF 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_off0000bef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF3 17608 bytes
SHA-256: ba3d71bbec3a528beee32ddcd2b5a360b3d469f15ffd0707ec4250e0ac326630
font_01_sfnt_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 10956 bytes
SHA-256: 522c461fff99d878fa35cf870c8cdac0da41d335ff83ceb6c4b0cd9f601ede2a

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