Malicious PDF — malware analysis report

Static analysis result for SHA-256 78477e5c462f55d3…

MALICIOUS

PDF

71.6 KB Created: 2021-10-02 11:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 02a3ac57d582cc5eae56fe1be69e735d SHA-1: c42b427c9e9be76eea053d1d4997ed57002b7228 SHA-256: 78477e5c462f55d3ce57494b6484643aafaceb506fcec6e3d65fcc6205459938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious purpose.

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://allytemp.ru/uplcv?utm_term=sea+and+land+breezes+are+caused+because PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615386974b9b4---fidawunolul.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140628e4550d---96604477624.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153869d093e8---wobexija.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/toronitutomawudosubolej.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/fepabisimo.pdfIn PDF document text
    • http://tano-cable.com/d/files/kileraladitetapimux.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/48331085060.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a79676631---64051973516.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/57575923976.pdfIn PDF document text
    • http://mweb.cz/images/file/putenizigajugekenisumu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/58948438638.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/gogifedexezadagipunebaras.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/junafunanirubunowonok.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614028e76e5fb---doberigutekibik.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/97739335353.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/wularutu.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/volumu.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/xuridabanepitarakave.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/depipifoxiritaxawa.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/pijojilowonujelusobeze.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615568b966e48---49866237395.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/pikatijirafomuragotatu.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/kulokezejelota.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/75796166317.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_off0000b1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 10428 bytes
SHA-256: 853c296e66da024147afe343ffb486226eaaf747ac2fc114c7dddd2190f7fba6
font_02_sfnt_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 18244 bytes
SHA-256: 2401e1176cb675ad2bc2acd323bf8bb960f1d0b358dc1821f4aa9df0260014bd

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