Malicious PDF — malware analysis report

Static analysis result for SHA-256 a311883337ceaa74…

MALICIOUS

PDF

79.8 KB Created: 2021-09-13 03:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 81b0e959ca6f697225c50c06d442df1b SHA-1: 5cc284c69fe8068538b807d4b051ffbc752ca7c8 SHA-256: a311883337ceaa740420aaa8ef99d6ac11f96dc244192c351b4d4b1011221203
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://erulingua.hu/uploads/content_files/files/62979362904.pdf In PDF document text
    • https://teater77.nl/userfiles/file/58180685355.pdfIn PDF document text
    • http://hidramaco.com/files/files/19769476973.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/vorev.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/76114054036.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210907084855.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vukotokugetajuworavajejef.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/sixeliramexa.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/ribufajisadamom.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/tojikeguxiwixirixiz.pdfIn PDF document text
    • https://granitnet.hu/editor_up/tanogimataxanila.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/bosizunupovekikizeg.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613b45e26a925---mugibaxipazisetawiburep.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/mutezuvupob.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/51635423585.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/45378182381.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/30268537846.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b1452337---koviforu.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210904085219_6si97x.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/80959386660.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/63519004435.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/12494051197.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/06a59858e4203bfa3893cb01bfa6a384/mevibolugojixowa.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/sikewajuvidoratexaxupep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2gb+games+androidPDF 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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 17192 bytes
SHA-256: 43c95940dea7b7ab9a23fdfd1f50b376cf3a9d4984da5d07454e2fb927c1a7ee
font_02_sfnt_off000119ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EE 10612 bytes
SHA-256: 5d14f6c1033d5177950e546a0edd440bcebe9730ed683880a88367202c244673

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