Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c45cb261641f926…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 17:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1769314d4ad5bd7cf069729595d7e4d6 SHA-1: d480528757e36aa48f06a727047f8749a6e948af SHA-256: 9c45cb261641f926bce5f50140c2c6bfd0bb1222f9f51a74791290a2c56c4c0b
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it may exploit PDF vulnerabilities or serve as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=xperia+m5+custom+rom PDF link annotation
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/serozasanefi.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/37913535380.pdfIn PDF document text
    • https://data-face.noithattoantam.vn/userfiles/file/bosuvawal.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614e73204ea9b---givezagimavukufidasebof.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/wumem.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/67173381828.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/bowumavawezunuw.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/93660780213.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/difividelikaf.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109100007552939.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/89676882032.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/liziwetiv.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/tumomusafafanemo.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/lasarepewasutewepof.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19263141110.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c272d351---fatarodosejutaxes.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/tedusutimivabememom.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/girelizubikufabenox.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/tifiposufi.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/64050909506.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/9783196141.pdfIn PDF document text
    • http://pieseautocomenzi.ro/userfiles/file/70662125102.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/vajuzegilakizinuxatugunu.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/zelijike.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16149501722acc---32279262577.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_off0000b44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44A 15624 bytes
SHA-256: 7b6c914fbb4d77e7b3aaebb5aeb92fa1e30ca26e3a0bf53c7199fc96138401ab
font_01_sfnt_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 10624 bytes
SHA-256: ff95b202d3dc221e1d5723b1a6b4d4aa02cadf0090fe2d3d85d75fbe8670274f
font_02_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1