Malicious PDF — malware analysis report

Static analysis result for SHA-256 562db5eef66012d3…

MALICIOUS

PDF

114.7 KB Created: 2021-09-02 21:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef98710f2f06efc87e9f75ec184ce271 SHA-1: f4ea8930022ad7213cc6b633245e6f986446c088 SHA-256: 562db5eef66012d3a0f5ac3d07812e91f559469bb9a96e2c9bb4d8dcb8a491ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/n56b3ppk57f2mfgctcil29cubm/zijenesalagot.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/359763da6f42ba772ac8e1e2937d97ea/92513774583.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/56762428570.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/kevaputipo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd8906cb48---60655737213.pdfIn PDF document text
    • http://ave-france.com/pics/files/pepafugizomalonajapog.pdfIn PDF document text
    • http://gr-chem.com/upload/files/dagafuneluvuti.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/nigiwomisotubexawadi.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/nabapimuzupu.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/41210790709.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///tevugulemisonezibeve.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/75944481473.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/f8bd2444511c0a7c43dcebdde771fca7/gixepivemuwupokemetaj.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/37581726572.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/11562734375.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/vegogulefugagikuwejep.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/57887032166.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/55613098750.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/el1imju7cr5koqt9ndmkn6pg8p/varerorotujufaz.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f1c088a87188e5d98309187a5217c98/40270094921.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/00c7b518779e2a0c4ed6a9f1474e0c31/18423601127.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c79a12c9d05---wumotosufevafowokul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fun+piano+songs+for+beginners+pdfPDF 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_off00015a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A2E 10748 bytes
SHA-256: 58c435d37fc7509fe9dcf0e2911a41ad514c13d301e87f00c7ee72ac2eb84985
font_01_sfnt_off0001728a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1728A 19240 bytes
SHA-256: 911b48e637a83182bcc188551deff9663766eb0c0dac4f3b7b4fbd80006dd638
font_02_sfnt_off0001a4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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