Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89123105cc22992…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 05:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c71ba87197fb9e6388b71dc29538013d SHA-1: 836bc7d23956dd49fd356a72392cbcc2b594e71a SHA-256: d89123105cc22992ed75def6249e8051fcde65be0a1bb57d1d3c0d88dfb5cd02
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised. The presence of 'utm_term' parameters in some URLs suggests a potential SEO manipulation or traffic redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vesimport.ru/userfiles/file/javujabegal.pdf In PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/95995330189.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613249b29b9a6---luzed.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/tejimul.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/7303018255.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/40b302897132f491415d732a127505fa/kiveguka.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/bawunabiwakikoravupitofu.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/30202369986.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/mapigeragamerefanedosu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49bc9c21c---totadukakogabenenosifaru.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ps0jii7c34871que78q2439sbl/xulemowan.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/benakefiwepadajivoraboves.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/nigojijewavamafutizanad.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/99367106111.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/lenavob.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/38436869664.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/34852569907.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/tobufojazi.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/kupovabewejanolo.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/9760785677.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/41883659243.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/koxonaxorilawuvepop.pdfIn PDF document text
    • http://pvvc.cz/files/45944344840.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/gelima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=install+car+parking+multiplayer+mod+apk+unlimited+moneyPDF 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_off0000d003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 18056 bytes
SHA-256: 8adac4450be239c3befe6c6009f5d1b63c93a0d671012fdb0164f96197358ac6
font_02_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 11116 bytes
SHA-256: eb7eac76fbd04db335d15acc1cf429cb534a4b4fc5361396243f646f9ce88633