Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d88a0ba7cbc433…

MALICIOUS

PDF

100.7 KB Created: 2021-08-18 17:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a661f9bf1bd99d9a4a345bc50fb65fce SHA-1: 9ff045d29995a1ebf00a3da57129de3bc3102d1f SHA-256: 61d88a0ba7cbc4333e78126d23078ebdda0f98ebd0cd4278f0425843e6125e2c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bobas24.pl/Upload/file/22076219936.pdf In PDF document text
    • http://nakajima-ya.com/upload/save_image/files/84531465502.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/55a69daf0a5bb66082eb8648eb80ca32/zitigafovazesop.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/13449151757.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/jukakefinuxofevesuwem.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/cubpfdjp51e701uh7enctarh4q/56997367039.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/37125154822.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/54327302528.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/tanefesoxawuzewobuwe.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a64b783a9a---78382957493.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jidemesanemomipu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6ff7aa4052333e5fa5a045e55b9c791d/fotusiweruzone.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcfd9cb951---mulefolif.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/9gdds14hkvi2fho004a8bhdal7/veketudumemi.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/medevolejarokoso.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/387b6fae2c804cf5872a2ecda7f6fd31/gabuzinemavefivifelatoj.pdfIn PDF document text
    • http://tochuchoinghi.org/files/lepurisomesutifap.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06a2a4ef87---63327705329.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8df8d1cfbc1fc6fe5d689aecdddb9030/71660932854.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f303380d422---8323218294.pdfIn PDF document text
    • http://954move.com/clients/4890/File/20747107013.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///69422000490.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd9606518---fatosupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ejercicios+de+matematica+financiera+interes+compuesto+resueltos+en+excelPDF link annotation
    • 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_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13086 11096 bytes
SHA-256: bcc81f1bb8178c69a030fb69cc25c52224349ca6c9355ff9f96b390fc16e868e
font_02_sfnt_off00014a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A50 21588 bytes
SHA-256: 0aa5383d70f78bf5ad47bf441f29939b33a62e56b785d264c02668145cd563c9

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