Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1de704f79b5f549…

MALICIOUS

PDF

83.4 KB Created: 2021-08-19 01:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9acc38d2acc913399b474dba61157647 SHA-1: 0835e104de264ee31910c0557214997204fd5d69 SHA-256: d1de704f79b5f5496ad779860291847636a4c83e9664e2fa78a7697882a17c01
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://aradovan.com/userfiles/file/kifisutudoravetoxarumuk.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/31a75gi3v83r0ucst7pupimten/womugomagakovibefi.pdf
    • http://wirtrauenuns.ch/images/file/20302875820.pdf
    • http://www.s-prom.si/fileupload/file/79989968837.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/662f57kahdf1u4b9d3gk5r8l8p/30938617903.pdf
    • http://avsa.org/sites/default/files/images/files/vinigumowewufapujulel.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/78014285907.pdf
    • http://vesimport.ru/userfiles/file/pobadilizedufetoval.pdf
    • http://latexindia.com/userfiles/file/vowerof.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/32d113f60d28a5c54e56f001a41110ec/87349972018.pdf
    • http://belgium-ex.com/images/blog//file/1879458425.pdf
    • http://stonebriarranch.com/clients/876969/File/74055004573.pdf
    • http://rgn2u.com/userfiles/files/83863045193.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6507c30bb2d3022ac60483a04921d2f3/19176373131.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/wibozonewedusisofogurepej.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/soxatadibaladerebiwujobe.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b658d3dc9---jegepolisudalidakejud.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ks2l3m4hirjmh6lijjdadoq6tt/butabiwavelivozisadu.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5qv2lncrlcsjh6549fpupuuus4/82289397982.pdf
    • https://fertilizergranulatorprice.com/d/files/44699082048.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/k8cjl6u4bc0vqqvn2qfvs6h9jm/32570674902.pdf
    • https://zbmbudomont.pl/userfiles/file/32066119205.pdf
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/samexuximixun.pdf
    • https://quanghuydulich.vn/img_duhoc/files/84410841119.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ide+ata+atapi+controllers+driver+download+windows+8
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e014.bin
04ba0295ec2aab504104dc27c61f0ede6f5fa7ca4d1bf6e44ec73e0898e85487
pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 18404 bytes
font_01_sfnt_off00010e9a.bin
33878e4251a678783aceb54bf933af25561711982f56acefe2822d4b127f317a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 10820 bytes
font_02_sfnt_off000127b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 16792 bytes