Malicious PDF — malware analysis report

Static analysis result for SHA-256 4805b7c089da6553…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 06:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35207bd05481ee1db8a6b23310cff623 SHA-1: dda983f5db6bdc84cde8e08f7689ca74c97a0115 SHA-256: 4805b7c089da6553f87f5faa21de43e7b516d68b1752f80c141c9c7968161a7c
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 functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of multiple external links and the nature of the heuristics suggest an attempt to exploit users through indirect means, possibly via embedded exploits or by leading them to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=kitab+sirr+al-asrar+wa+mazhar+al-anwar+english+pdf PDF link annotation
    • https://confidence-ist.com/ckfinder/userfiles/files/luwavatuwepufes.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff77f03664---99871620907.pdfIn PDF document text
    • https://uangraja.com/contents//files/97736659916.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a494c153d6c0b772c7eb37486ebc3c0b/vavowirazalogapifido.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/1293773116.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/74247136982.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/49a27fc726f5fa1eda25cb039a88f785/jademagiv.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8cd0f88e3f97def68a469630502e06a3/muwetutavexobunaderitari.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/kusasazinalutexa.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/putelob.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/2617654561.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/50655510262.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/99281016634.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/556828e19348e5025e3f783de818be0e/82558095468.pdfIn PDF document text
    • https://susta.vn/userfiles/file/fezodosilifakegex.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/69942574860.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/29789764693.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/43641134890.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/votawiwujategi.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96436e07b---63052932225.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/67c19a128bbb01bf724fb221cb1f2d20/912372128.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5329f87f47---51123848804.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_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 11136 bytes
SHA-256: 75178c394723f2b92cd39d8f5d8ccf64ace7556ff37e499e0378fb549841e0bd
font_01_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 19948 bytes
SHA-256: d8a4dcd43f8e84bac60772afee564e51a87ffb7062ebcc4a1e3f280ec571e2d7
font_02_sfnt_off0001294e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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