Malicious PDF — malware analysis report

Static analysis result for SHA-256 91744c19780f8e02…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 23:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c9d963002478106920eeccae0e217e02 SHA-1: 47cdf37aa96942d72f17eb71d42fbbee792430ae SHA-256: 91744c19780f8e02ff01d3f001a8568fccdd611edb68b97dadea729e5ed16fc8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The heuristic 'SE_URGENCY_LURE' suggests the document text attempts to create a sense of urgency to prompt user interaction. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://allytemp.ru/uplcv?utm_term=edit+pdf+document+in+mac+preview PDF link annotation
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c22d372c7---48737687793.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/xoxitekifarulojopizi.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c8318f3f---51045105407.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/pefirelenolorositeti.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83960883c0---lizazaloguvewulurita.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4207c258b---zoseleturubor.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/21262590124.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/tuzagajagixuze.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/labufojujaso.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/mizojivatog.pdfIn PDF document text
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/95759510836.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/ruxegijatazebaf.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/sifugovasowalenodovamuk.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108131113347564.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/131c5929273448c5f824812363532472/44413195248.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2d833d89d---31714140483.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/cf12128aee01c07cc1fb63165f8549ec/28895672889.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f0b205f9da5d0be230f5329f0adcdc35/fobedafexaludipix.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8236ce3ebeea84d8313f85051d45695f/24988355541.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/xutujugirubuluruvef.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/05d7b03885fd1715cb729648201f0d39/gapuxetob.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/wutobetop.pdfIn PDF document text
    • http://babamoleskine.com/files/file/44496559383.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/48544817042.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/sibidemurov.pdfIn PDF document text
    • https://kede.org/userfiles/file/60991406825.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_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 17704 bytes
SHA-256: 19210f09dda6505a00fe26e702f4833584dac9000a7995298fda587cb050e3b5
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 10804 bytes
SHA-256: 9b7eb59b991bece460b7539b99320d9f29533194fe1c5941616634383ee70e52

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