Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf89998b655684a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-19 12:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 91561dfc7d7b380b514d0125526482c0 SHA-1: cefc31d81a4e43d4f1fed487668661e3327facbf SHA-256: adf89998b655684a86eb734084bf67f171e0a3ffa1ce0049d1c797995ec32a1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=hla+hart+the+concept+of+law+pdf PDF link annotation
    • https://jagominum.com/contents/files/riwilisumonofiz.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe3b1bbbe---79425554386.pdfIn PDF document text
    • http://kasand.com/userfiles/nafepobexipewuva.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/71261847754.pdfIn PDF document text
    • http://linker-apps.com/files/34733419024.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/56561538345.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/jixulubez.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/8hactahfefbvco354hcukjkq0i/motimijaxusovezedujezede.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/xafepimedejumavolujafu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c71b6d2d97544425c4c1977a20016325/8902231340.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/kanix.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/96444239076.pdfIn PDF document text
    • https://aneri12.cz/res/file/dejajanekuwekozerijiroj.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/27133135620.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613526af6cfad---26012041785.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210911155542.pdfIn PDF document text
    • http://slovoveri.org/userfiles/50563414847.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/tozopisireberikije.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/42265749841.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/duvapatoragegajusibunu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcbc6dbf1---xefuwumurage.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3235fd31---96110436341.pdfIn PDF document text
    • https://adci.vn/data/upload/file/desosegamute.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6568092542.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/gopujejuj.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_off0000b5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CB 10536 bytes
SHA-256: 759edf7b42d406ec3799ba4fd3ad579870423eae4bf9d0e20f3b257dc48b5509
font_01_sfnt_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 15040 bytes
SHA-256: f219ba8e1b389c42f4d92dc863da4f50cf9992d4845d1de456f0305ad0580867

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