Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3a5a2b2e27b337…

MALICIOUS

PDF

86.7 KB Created: 2021-07-09 20:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da4e92e4dc3c31245c3b033d3d2ed8ab SHA-1: c559f890965b03559809549b7c24712d0af22f16 SHA-256: ba3a5a2b2e27b337c874b3067b1afe5cedf0ccaaa613ad4e28ff4d6b50b22ed7
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic points to an attempt to redirect users to malicious content.

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 https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d624465e120234b28ca7b2d7e2d0954/16710527159.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b081aa8c---fivenuduwowajukakika.pdf
    • https://al-farh-iq.com/upload/userfiles/file/79359387144.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc997dcb69c---diruxotax.pdf
    • http://market-oborudovanie.ru/upload/file/50905504.pdf
    • http://archifolder.com/userfiles/files/56491014564.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607da3c27de6e---katawilozugegibo.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f8b1fee91471edb339e528896f6a0345/93097348532.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/d8b1o0c90106514e18gndavm7h/neludizavajaxepisuxitawo.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1ec89fd09---kulikoxokokuvitemokux.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8cdc78bfc9dc3a417841de829f39a457/dirasenevasuvofojometev.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9c9c853c42a5389efe4dba069a9aa4cb/58261767270.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/27389713898.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc2b73003a---buwikolinazap.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7459aa6b61---bomerezax.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/kfulut9v1rbcb8judl2rte8p74/diwatarefelofasibanejin.pdf
    • http://jshtextile.com/UserFiles/file///dosusazofojojemunedix.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/93b73c6ee98afb52ee375b770f5f3c28/bomawinudugazak.pdf
    • http://aimic.com/userfiles/file/36888266644.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/af5cce297ccde35d12d29535f12fb975/tesesodudagaviwabokul.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/vekobifijebudezudogowitox.pdf
    • http://shipagents.nl/uploadfiles/file/mubevujaralugezinumu.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b850763cd20---14185048872.pdf
    • http://sharon-barron.com/userfiles/files/70338008528.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/e61h336a1hu6f9am83lpdmqbu3/18577657294.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=male+singer+singing+in+female+voice
    • 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_off0000f0a0.bin
c0a2eadd37e8e058fd172fb554abfa8b311d08ccb42d85b08d31e3e871760eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10640 bytes
font_01_sfnt_off000108fc.bin
6f867c2fe3af98725f9ed9175d1d69b7167fb69007f6cc8bc92923b7e56d4d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 17040 bytes
font_02_sfnt_off0001352f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1352F 16792 bytes

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