Malicious PDF — malware analysis report

Static analysis result for SHA-256 900107412df73bcd…

MALICIOUS

PDF

110.0 KB Created: 2021-07-03 09:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b940f5a888f5cecba1828a6eae96294e SHA-1: f7c2d08542b47483c55ac7a426dcf2cbdd4c7199 SHA-256: 900107412df73bcd2d93765084eef3cd1b3bf6e9c96fdb5928ac7b00de4b9dc1
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to click on links within the document, which are hosted on potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e888ddf8---zunaf.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015e6bafea---derifakaxomagunadidufo.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/86rb8ilpldo7g6nfolivfcefrh/39954769901.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6dr5l168mhovafp0j5gg8eptt7/dotuximevawajojizi.pdf
    • https://webtechnocrats.com/upload/file/gezetavelorijivom.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/b6f4023dec8c5a8b392210dac1f2b05f/ralokopazemojadodigurag.pdf
    • https://locktactyuma.com/userfiles/file/pojiniv.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021615015337036.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8bd549fc---pujovuvivutojogaxedosi.pdf
    • http://alumcity.ru/userfiles/file/71896268167.pdf
    • http://hanlacsclub.com/ckupload/files/78741854810.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/repimutodaxogilajiwi.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608106081cd08---11704529614.pdf
    • http://degrossier.nl/uploads/file/labimivafudow.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/31079338456.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d1af89613---jepevogokomatifaseseg.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae8a07203c---22303894247.pdf
    • https://avenue102.com/uploads/file/93246403762.pdf
    • http://0851gay.org/userfiles/202107file/2021070103023770554.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089209f676c0---fepipadolivorewu.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/8f3a012d79bd60c4fd4cb56f85ffcfba/fukatofevig.pdf
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/98052405671.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609be0c49b77e---zuzofo.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b771dac791---tazibebovaxum.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b1c887f8---22449656032.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff61f87b91---15725516834.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ghoul+and+ghost
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013377.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13377 16792 bytes
font_01_sfnt_off00014b89.bin
250eb51d3938dde5a4b09902178e5bae91c6bd272b90b7b53b5813537d2a7c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B89 17292 bytes
font_02_sfnt_off000178b9.bin
fc587996532959effc5d94a7696f1de76a4688d5eef75b9b18001f80b4a1d093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178B9 10340 bytes
font_03_sfnt_off00018fcb.bin
9a7b4c2e0c298d5f6537f44d1d451dbbc0cfa54b9e511a0b77db19f04696bf07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18FCB 7904 bytes

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