Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ffc6e73a7bb37e…

MALICIOUS

PDF

109.0 KB Created: 2021-07-27 06:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 02e42745d419d664403101cf6e0392c4 SHA-1: a7ab626fbace3d91cf5dc5fdd5e5be3b3f133581 SHA-256: b6ffc6e73a7bb37ec2deb7d2f5000a61e339b1635148c92f28c3301bb5b9a64a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. This suggests the document is used to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ee313ced2af1bf7daab49f6d25e879a6/viduf.pdf In PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/diziwix.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210520162151615774.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/sevavukibuvuvadube.pdfIn PDF document text
    • https://senhewood.com/d/files/wigip.pdfIn PDF document text
    • https://stvorki.ru/files/file/manawonivitize.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/aa86316a43e6adfdc08c7a4a47b4fb40/xezupotelel.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815673e4a70---91854928834.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/finisiwedo.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/7961532855.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/papepunedewizetoximowot.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/80438230656.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b52d2635a2f1b3a8ae96889e43aefb51/gazomimeli.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098149da370f---mujujaner.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d56695ace35d31e818edc5c45779a3f9/jidopufug.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/22032521460c2b76522847.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/tisoxakumuredipinowe.pdfIn PDF document text
    • http://chikatere.com/Upload/files/gadawowoselujobozovab.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/49de40689c9eab2adef4cf38b3c4ed1d/98214190841.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/rudosowuwelarizozaf.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/naliwujof.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071515f8af68---rarodamezozujatutewebopof.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/mc51uu8jprpa1skvkfbgqfg1oc/zerikanazevezotibanenu.pdfIn PDF document text
    • http://trevorhannant.com/89353041412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+month+star+sign+is+taurusPDF 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_off00014a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A11 10472 bytes
SHA-256: 189b54f4bf054e9b1964b24e97073aca4dfb54b972c189ee5eead22281ec8cb9
font_01_sfnt_off000161af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161AF 17044 bytes
SHA-256: 1d3b189f1d6799d25931606814902a85adde13c929856a6988f36984fbc42391
font_02_sfnt_off00018e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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