Malicious PDF — malware analysis report

Static analysis result for SHA-256 2740cdbcf933e9ad…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 00:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb9599ea6cbbcb88f2427cb5f0b96d8f SHA-1: 6bc34299dabffb27707dc26806499fa9deb6c194 SHA-256: 2740cdbcf933e9adc098105b26dfe4aae5d793a42ab43ea433788ad9506658a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sunnysolutions.it/uploads/assets/file/lubojerazi.pdf
    • https://appchecar.com/ckfinder/userfiles/files/rivirodunarifowoku.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/5ee354fefd33e7b6eb259f4bd6db917d/wufuwusavipugiwodu.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/586cf6944080d1c8f0c1297721615274/22110469845.pdf
    • http://mishor-uvk.com/uploads/files/27304669839.pdf
    • https://swift-tw.com/lcc/upload/files/papegemomuw.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252887cdf---munixezex.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f95b0720c---miwularorunepewigirisani.pdf
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/zuwidir.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1611a20197b88c---guxarup.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b80382e306f---fekivufumoguluxa.pdf
    • http://entrackintl.com/uploads/vovapote.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5491762ca9610d1a936cba5ec55c8a6d/33388796414.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/rutobigomoserudogaxojovu.pdf
    • http://mamtomchabahai.com/uploads/files/files/49648359375.pdf
    • http://rockbond-aac.com/id-admin/fckImages/file/vimewogigonob.pdf
    • http://cbstav.cz/file/zamusufiluv.pdf
    • https://holocaustresearch.pl/nowy/photo/file/61139675067.pdf
    • https://gotoko.com/cmsv2/upload/files/89684256556.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d221130ad9---gupiragiziwanezuna.pdf
    • https://newtech-utm.pl/userfiles/file/nufaxutakinuluve.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/46442321508.pdf
    • http://rucodelniza.ru/userfiles/file/jiwixipurinovorado.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607b96d0e92ce---1338391625.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=solving+quadratic+equations+with+complex+solutions+worksheet+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f5.bin
9e02771b2cfac448cbb50e036aedb9f69703aee6cdbab4f682bd22b67ae99d69
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F5 17456 bytes
font_01_sfnt_off00010142.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 16792 bytes
font_02_sfnt_off00011959.bin
7cd2ac81b24050300156f67f2cc00365350c9362a194076577d70d67d83c17fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11959 11732 bytes