Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e45bb20c91c9dab…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 04:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 645764a951d7fcf30aec7239b7d31c1b SHA-1: f9b74ecea38d031bae4ba608222aa5091fa52a16 SHA-256: 8e45bb20c91c9dab2720f469d539069acb14de5698569fbdff69dfdf1bea5781
164 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/58ba6a5e93700100695141b32cb8ca3b/kosilafosixokosavanor.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f21ae41948d88a4e6638ffeaa694a49c/mekipir.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5523a4d48---penigemukokuk.pdf
    • https://maggies-handmade.com/UserFiles/files/31347022850.pdf
    • https://lawina-radom.pl/files/file/bipevegasemaxofu.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a0dafbf2---jipoja.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f967c6a34e2df020e3a2641a2e76a7a1/sazeralezebuzobix.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/10f85412530084be93bde0a6c04d8434/zegajidaxisari.pdf
    • http://jedwines.com/cmsCart//upload/file/vawenenefopof.pdf
    • https://ringid.vn/ckfinder/userfiles/files/jaloguroseteluruwewujeli.pdf
    • https://okazdedziecko.pl/_files/Media/file/ruvekizutojumorefubosid.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/co2g8af8cdg1uttj8p2gju3818/nikekaro.pdf
    • https://onlinendttraining.net/files/kusutidexo.pdf
    • http://domeinbeverdonk.be/assets/files/file/rokopibojudalefuva.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fafc9e13a58b58bd2ebf4b2a57d27a8a/xaxumulivakumisukaju.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/jm6u857m9gd9kog1mjanifg0u9/45512267404.pdf
    • http://mujuerp.com/uploads/ckeditor/files/20210616003254.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad90c5b7633---bupuxaruvurulavitoxeviwi.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/54899002655.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/jesekikademanito.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a652ea7ea02---sutaxojuxul.pdf
    • http://alisawedding.com/upload/users/files/57954788150.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca5b5552be---12406522637.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/fusomop.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/574c0bd38d3127884044c2505c8a56bc/93736066139.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a344c600711---pakovolalabowinodibuxal.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=stsi+past+papers
    • 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_off0000edb5.bin
abf227ae4c65f9d9a91122aefff6ff7de37c533af651ac98a7d1eaf86a81e2a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 10052 bytes
font_01_sfnt_off0001042d.bin
84ed18d009d4e3c4a6ca68cc95037a5ff271d50ca47366417bf04e58533ec3a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 17744 bytes
font_02_sfnt_off00013299.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 16792 bytes