Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd298a4af69c3f7…

MALICIOUS

PDF

92.8 KB Created: 2021-07-26 10:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bdc13e711a708435c47b051ab6bc923f SHA-1: efb25ef7284de19fec85805e7178d1077c6f5f27 SHA-256: 1cd298a4af69c3f7c24139523372fd73143cdaa00a96fb6b034bac20feff9a49
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and an IP address, likely for phishing or malware distribution. The presence of numerous embedded URLs, many pointing to potentially compromised CMS uploads, strongly suggests a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://fotografieindex.nl/images/uploads/246369770.pdf In PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/bmifdk76qkj5lrv2mp48vjtu5d/65703004428.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ikk7g7o9f15ukpimdjsec714jq/nojim.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/37150808833.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/deririgemazomozewe.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/47494846168.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c022126fa7---dukakafatisunejulabekuta.pdfPDF link annotation
    • http://www.asslar.de/downloads/49281184693.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/g6h9blu6u6e7sjlo556u3dp0h1/xikiwenotobumexepebeji.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/vutujumif.pdfIn PDF document text
    • http://balone.net/_upload/file///sizepirutaba.pdfIn PDF document text
    • https://airbays.com/userfiles/file/43151564004.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f3c53a0323f5970c07d5f8f6e4728932/87508345663.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/lolufadopesafujozezibaw.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/bc8486e0fcc727f6e52b5213c9706995/63651556894.pdfIn PDF document text
    • http://veivel.com/userfiles/file/5274792107.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d3447b58288062faaa67cb8fca48f6f5/dasopidilamuj.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/nomobafojis.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f9956cffba00338a46e7db286d03bed3/gubugugasivusikupake.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3d9cb10e9---pijowogogetutaz.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/31998931108.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced66cb658---pelojoxojuminete.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ba46d4473e784fc38bf4dbdf2fb6ee99/95503267966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+reset+filter+indicator+on+samsung+fridge+freezerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 16820 bytes
SHA-256: e1c5d63114ba455ef06fffd7941c674e7ac1c7dbe542ad0184841871b78a69af
font_01_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 11056 bytes
SHA-256: 1478c76876c732be0799828cf8580f5925657415e42b797745d0051f95d989a9
font_02_sfnt_off00014495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14495 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_03_sfnt_off00014c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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