Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d43c57b6bf0e4f…

MALICIOUS

PDF

90.8 KB Created: 2021-07-04 04:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b71732b7363ef195cf45282c5260ca3c SHA-1: 499dd8c3e448ad89d87760082ca2e510cabf7cb8 SHA-256: 70d43c57b6bf0e4f9156c8d073cc26f06259c3d1068f38fcafa9e12cbb47bea3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aklond.com/UploadFilesfile///2021061105483048.pdf In PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90ab474e0---wupedulexepebetafaj.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/72224163705.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae6797793c---6931984903.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0a643189ed3724b3b034d23758a1384e/jotapasoberuzeluxun.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/sosezov.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6312d253---kodiduzabufesepax.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/em2g0fvdsm424liceikq3nc1a5/99739064197.pdfIn PDF document text
    • https://andrejc.si/files/file/51725965323.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/3795c13f5fc2f03f62ddf38bfd6c0c30/sosetaj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f924669b79---69511179700.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f2ca82d43b---fukonadozibogivisebavenu.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/xaxijivenemake.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/25689303097.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/6sk9fsdeh7tm3pjmf26fgm6n5q/46911033031.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/3381578735.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090751767a59---5168605697.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4e001e3e6040c3693aa91e3f3cd5f029/41711015249.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7rkqpedto3mhtt8f9ukqpp6n28/99479871824.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/47134118824.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fc2d3013126b45196502320974cc11c2/79036029422.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/ludumozeli.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/vejivupomudixopemi.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/2fff7b8521f5d09911d973c66e3a2e68/13527515185.pdfIn PDF document text
    • https://actorconseil.com/files/file/32545801979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=another+word+for+notePDF 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_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 17652 bytes
SHA-256: 304b7f69f5c7a4d3431649b82301f29adeea24e305967a6ddb03c68a3c14c3c8
font_01_sfnt_off00012e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 10052 bytes
SHA-256: 6bb61154a16ce4cdce705dced08d0ae214e177f0a25cfeef04b13ede89fd7b92
font_02_sfnt_off0001446f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1