Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba7da6a797b1914…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 14:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: de60e6a0f126682703e7fb923333abe3 SHA-1: 0d703ca024a596f154fc383f9e667c52ddebdfc1 SHA-256: dba7da6a797b1914989ca26c300723b170febbd810b7ead013ec0d75b75a41f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm pointing to multiple disposable hosting sites, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the structure of the document suggest it is designed to trick users into downloading further malicious content, likely through a compromised WordPress upload or similar mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=4shared+download+android PDF link annotation
    • http://giasuthanhdat.vn/Images_upload/files/2998637237.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/komuxasaxitiforaka.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/3162926363.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/87647707173.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/miratofomavabuk.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/vonaniwawatetow.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/oj11bncchbime7sn4nvn9hnmcr/20395026728.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/wupabo.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/tulapikotikitosavunil.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/rq5snr8e6if7btafjjiam6b58f/gelulifexopaki.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/56f7df892775671c0d146d58aa0c5fcb/sisajadikegujoxaxura.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614af2a61f4a5---34135389050.pdfIn PDF document text
    • http://centrons.com/uploaded/file/20226454361367902a8788.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/63971345113.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/86043627726.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/26735105532.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109022248327224.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/11679067145.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/pehietjto1f3uvmu7q4eqtqaqj/defivudo.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/50975169091.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/33576134194.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/rosokopitixa.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_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 17076 bytes
SHA-256: 452a647337535d44688723f0ebd7e37ba69777163764a06e4096cb6e3bfc6ac2
font_02_sfnt_off00011bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 10316 bytes
SHA-256: 8fa02e171a206d2e42378d8de0c8a6c47b51b543cde482e039965b9daeae07d6

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