Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a625d3cbf218857…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 03:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: abc56b53e8fe5edcc2a7e23e4fc43db8 SHA-1: ba8e3ef8d5f37685ccbd4ce97819dba5db05a3fb SHA-256: 5a625d3cbf21885736fc2708b5efc71157bf5518280ce1d4157af79a9badb90e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a ClamAV signature and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely intended to redirect users to malicious external sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=the+book+theif PDF link annotation
    • https://www.ijestr.com/ckfinder/userfiles/files/97487063715.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eeba9c248---rujutebudamimuvef.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/67519080078.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/83171956408.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9853968f7a67576cbcad837385a45a83/66574060370.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/79929570706.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2d030d2429ca3c6806afb13a848c8adb/66035646458.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zevifod.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/284848583.pdfIn PDF document text
    • http://btfa.tw/upload/files/tutawebavub.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/peziwulamatulijawofid.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/xajizurezevajed.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d5655c3b7b46efaf869a0abe8aa7e90e/96387799682.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/68067264990.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/30b1b92fe150665cfd93e05e2221c45e/48450474754.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qhu0q8tqptjid36phsf45b2spv/37358984695.pdfIn PDF document text
    • https://masihpt1.com/contents/files/66842022393.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/96162465087.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d2b0a14d0---32697049584.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/wilojaw.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/likasupolelarajep.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/3863921196.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/84205589136.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/29962546053.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d96cb53021a029893d09bc687df9fa67/pasabubutezuxavojogilibox.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_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 9924 bytes
SHA-256: e3399f19952d1924ce8857bde20fb07701b05c4d47ca088e08e057459cfa30e8
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 18020 bytes
SHA-256: 19fba514f92c3476f3fc129cb62efb0e94c6c65bbc9ac41598f90373211f1a7c

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