Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bce0abd98e0a538…

MALICIOUS

PDF

92.7 KB Created: 2021-09-01 10:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 799f803051957bc3e609f5c5ddb73681 SHA-1: db9d378acc0cde447b200ab400a128408c45f886 SHA-256: 8bce0abd98e0a538194745ec628f58a63dcfd831b002e4d7ee6d92b5c8b9d4a1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The presence of external URI links and link farm indicators strongly suggests an intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://garglob.ru/uplcv?utm_term=pre+packaged+insolvency PDF link annotation
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd6837767b9ecf9ad667f005fbedfadf/86842725287.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/wopezutus.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/37325539208.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/sodufegur.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/32871459749.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/3871484573.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607129216ff11---samomudisovu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085180296301---97382587998.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8jjlv8i3ui3ctgqvms6bb43g8e/mesewelefimofekuxogujo.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/17928474859.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b22f118462dcbaaa8c655820b76acd0a/tigoradenapalaraw.pdfIn PDF document text
    • http://idroter.org/userfiles/files/dojesizakikova.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c807e16452---domizomivowal.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lilix.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/6ffbdfd4cabf53acc0a5a12444baeac4/35258723300.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/q6vppmo7r61thf425n7g88k512/93594177185.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pmn400eu2da9ilsch3mh7l9ib1/paxexanoxazuvefos.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/dazes.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/63693944654.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/redopovatazutigofafomojo.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/bameg.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/f0ba340b04b1ef21aaba2dd060f02bab/gazenerivafotat.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec0046d89---93550018803.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/66be08b182cd2c9940317a7a0481c2ba/watisolowitafu.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_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 10864 bytes
SHA-256: b1ebbe72c8ea54c344a3098054560e97755e123374bb6b8a6ddc50859d8c333a
font_02_sfnt_off0001354e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354E 17592 bytes
SHA-256: 51efc682ca451ea558a01862272a694e161400550c4f24c8bfe2f0a4a8b263b9

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