Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d4425284890535…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 17:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 16b002d766d150a1e1158b6ffe253699 SHA-1: 35bdc7887260fcb10d13abebbdf8cfd103531ea1 SHA-256: 52d44252848905351afea666e8bc04f1d34c956df30c421c6f164ce87bdfaffb
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including links to compromised CMS uploads and link farms on disposable hosting, suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into clicking download links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=tracing+lines+worksheets+free+download PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070d65ad1018---jizenataporef.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/dipab.pdfIn PDF document text
    • https://btegypt.com/file/berumexa.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/imattbdgjp7nltjiolikqknn95/94720885919.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/bubunopuzubesag.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/zerogawurulasul.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/lowuzafiperize.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/5s3l4uvq0k7reivq32gjcieqlf/giraliwatav.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/juzesunapivemarixer.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/80203787c15612fddd8f395e9c8ad53d/70250005530.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a53415fd02563dc290ef234010c650fa/27473684410.pdfIn PDF document text
    • https://rcot.org/userfiles/file/87380861780.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160782d20f3b37---57349859019.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/3918929207.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a96f395545d---bopetepogokanizi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5m1eb7cdubdrq6mnfg2mg49blc/vivijoxaratenixonuxi.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/rewevijobaz.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/61954371715.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/r8pu90u8o0pm74vc840pifrlje/79182624412.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92d4d88a3---jagad.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c91a128ad---sadexunomufoxepuvelid.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-13/20210613064501580642.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4493db04b4---koxudilataraxujuvi.pdfIn PDF document text
    • http://argumentua.com/i/file/seramamatatazipebake.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/wizotisiwanujirotiloxub.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a847834c0e---zovixilemijotexekem.pdfIn PDF document text
    • http://chamdure.com/DATA/files/vebezibexutose.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/38426578408.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_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10896 bytes
SHA-256: a9a46f9aee7d0a4a3c2d28c063cdbde5578c957c34c3eed6d0857974292abd7b
font_02_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 17112 bytes
SHA-256: 11ac1115b1d1d98d645d76035b5816ecf54d06dea45c101fe2a18296636df35b

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