Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60635e5248ddfe2…

MALICIOUS

PDF

95.5 KB Created: 2021-07-26 08:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 255bec431f2862a63e2f51f82ff08de9 SHA-1: b38fadfbd2fe8132ce721f74ac0ff31dea97c533 SHA-256: a60635e5248ddfe29a7150e145f903c87a90bead0760c77ad380626a26247255
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to phishing or malware download pages. The presence of external URIs and link farm characteristics strongly suggests a phishing or initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4342b1a55e11cbae88d5af31b7f4f262/73122002685.pdf In PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/rajivajoboxesasaguz.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/17011028394.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/94a5f4f2d69376af6b5a5b877414beb9/2125891337.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0a3e75e607bcb7ce70df89973635d357/jutixilopu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f1cb5b54---mosibu.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/15976694030.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/zasinara.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/mqjntredab8ht78tkbhkbgtvth/kufuvuturuxavedufegi.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/fenurowovakaw.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b028c66aa5---44177441178.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/mejaveguzopewuzanusogod.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/e484c76d6313e1e741a6d3b89403e984/90445770187.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608726fb956f2---45261369143.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2ht7jcmmduajdl2sdsvtd62r07/fofunujufaxokixitoketa.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/edffc2c7e82a068c1b041327b8691c1f/tilorolezavulovifasanos.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1bd6431df---pikudutivujij.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/9befa2e1962ae90245a4d438e582ace5/jafepiwoxuxupidikevewugav.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1efe1ff12---xomusidagopabe.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2900e8666---fetiliruxixifixisureg.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa89f311f7---nekobezevamorovelivew.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/15550338902.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/zomegagi.pdfIn PDF document text
    • http://bptramptour.pl/files/file/52431395562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=grand+theft+auto+san+andreas+remastered+edition+pcPDF 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_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 25540 bytes
SHA-256: f7059389335ce4014eebd1f79fe343e7b0ed8042a16d186f5cc5b9af0bc4c49c
font_01_sfnt_off00013d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15586 10980 bytes
SHA-256: 0de3d7791772c8e69928f7592c06553f7e90bd63a555498d2d0226ba956bfa49

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