Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c42fa7ee5b6a5fa…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 11:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d9c4987177f026365c5938f5af5c62f SHA-1: bbac072a061d08b9dab0be0ff5e0f39134279658 SHA-256: 5c42fa7ee5b6a5fa28e22c537310c932ee7843d5884ae4937f7d0439dc8ac0f0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=parahuna+full+movie+download+hd+1080p PDF link annotation
    • http://mn-print.ru/ckfinder/userfiles/files/zanelatux.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/pupisevijefexujogelex.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/40494237543.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/jizifovuku.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/97103594066.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/vexinusaxalavesak.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/kalutenuxosodew.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/68572634007.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/dibogem.pdfIn PDF document text
    • http://4yoga.by/pics/files/zamabudilonuvow.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614134c9a8750---zazepi.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/23561651496.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/tidoxenotago.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/61239910697.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/fofosixonigekowukutefopi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161364111e06b3---jifaruvelogexiwexoz.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/29278237284.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/ginaxifot.pdfIn PDF document text
    • http://rnralpha.cz/res/file/2798218701.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/58856222745.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/98461706753.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/18248921675.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/16aa58196dc9b43c0288f959fdd020da/rulafigamepi.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_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 11132 bytes
SHA-256: 23dd22b9a1fa532c5cbed226a155e939a2e2fdf238cba52538b0d43dd0517361
font_01_sfnt_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 17544 bytes
SHA-256: bf16974419ac02f5a85337e5eee4ad4039ce28c3f62f6e770244a4e569983fbb