Malicious PDF — malware analysis report

Static analysis result for SHA-256 794b060eb29f4a59…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 00:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f3d74cd5cca8d45ad0649800d1dcd918 SHA-1: b43d6c160b638d5ee7a6150af3280e20b0409581 SHA-256: 794b060eb29f4a59e650557a42a6696cf3e14adccc308233cf529ef91898b4bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=autosuggestion+buch+pdf PDF link annotation
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/be981d4356d66f66ea434f2fe63fb1dd/nuwevijati.pdfIn PDF document text
    • https://network-italia.it/file/71840606542.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa//files/46060270424.pdfIn PDF document text
    • https://asken.as/bilder/file/kevudogidasaputuvafejugo.pdfIn PDF document text
    • http://svx.su/ffile/file/xilutiseneda.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c75c20b0dcc8e739b887564df47a451b/daniviropufaralemobe.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd24c673d4---30108755559.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/41236cbf0ad2b165fbb8d1f0ca54f763/55431088087.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/86465944924.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/banujuribelik.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a1731b88a---78557379227.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1ca53e0b20549902e19c7ac664a848b/gexamixeruwofebari.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/gapidowul.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/a67kkkfeoefopu6ldaru075rfp/dalubutemabinili.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/13886299021.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e446d759505dfebaa67bd816c1bf3313/lukebipixolonolakek.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/79945265410.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/44285454042.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/vujodewux.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/xiturinevunapudowoda.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/1a742fdcc065ea9601130771ed489a96/69466182644.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/mezimirefadekibuludeji.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/fazasepufevifezedozoduto.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849507d2bae---firitataleda.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/76010309505.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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 18448 bytes
SHA-256: 2c3e9fd648f1e428dc2c1dd8887b77e4f7303908571f0a931d2f19aa894a79ba
font_01_sfnt_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 10812 bytes
SHA-256: e6f7ac98900e0bf0976435e080876d4b6685b211f858eed020e518eb289909e5
font_02_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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