Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12ce2cfef90c998…

MALICIOUS

PDF

88.2 KB Created: 2021-07-01 13:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b336a93df54b967e7ec0e0f4291e0b24 SHA-1: d6da00552e650eae29a0aa74e65a1e81d705f884 SHA-256: a12ce2cfef90c998dfc656d846c14081d42e89ebe186f7a75209084d683c5d01
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://allytemp.ru/uplcv?utm_term=good+pranks+to+do+over+text PDF link annotation
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e6856ea345c6fd3d268b5cc208a76f8f/53603938247.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1d557b9b7ba790354e6c2ebfb541c20d/61408984532.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/sgqbcq24ke5gmtnishr53luvdm/dowekakadotokas.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/bb2b757d26057963010696f15865fa7e/tisepotebewixumoxugogimu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/16bdf28aded9d35476db3c0bb8d2e639/winebaderawebo.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/3agj93gg0tqb7jt8b0ha106lrm/karakigopolijeva.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bgmm4t8bp251o19a78eepj2mp9/zidijure.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/dusuzepo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da714e257f4---buwusiligifotifof.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e22b6eb8d8---33697912699.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ld5kmgv2u1nlslmqrd8uud6pdn/49120096637.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/rivedodofetomo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7961f10fe2bf3676f5219656712ace3f/82150967839.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/81513ae439a494760a7a6ead0339fa44/68750982766.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e9b58389a---sewije.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca0aacc8c---3115222284.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/dcadd4d2838477b96f0de195a88d8c35/90860689166.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732dfc189be---bejezodomoraluvatapogu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/nicbirn8dn090f2mna0gtgcrjd/56985197704.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/jadikirilododi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a69003d2ba41034ca9576edf37db928a/76868519439.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/a8aea041b832c639d426120d8f65ffb5/namobipikudozidagaj.pdfIn PDF document text
    • 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_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 10544 bytes
SHA-256: ebb44e9bf6c78fe2c331fc20b05321aa8a39431571c67b52593a4e43ce50b92a
font_01_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 16604 bytes
SHA-256: c81479824889ca8c3a13159abc524bcaa2b69d4fb2321332e0d9dd853f5d9709

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