Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32c34f18de658ba…

MALICIOUS

PDF

77.0 KB Created: 2021-10-02 23:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 678f28b7ef1265e16bacdf8940c89e63 SHA-1: 53c05a1fa4b359e563be2d656af808667a3e8fd8 SHA-256: d32c34f18de658baa9004be6774685e90c1ebe2df83836a077522bdee6b5fb0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://hmconcretemixingplant.ru/d/files/13514109279.pdf In PDF document text
    • https://termofriz.rs/files/92930378240.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148b4f184338---42428782371.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434045466e3---79942590107.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/84221900262.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/41176491976.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/kibelufezet.pdfIn PDF document text
    • http://flirdining.com/uploads/files/75005772287.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/20551017989.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210922221259121.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/dovafulododasemewukumaf.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/miwurigafatisazunudux.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/664239546.pdfIn PDF document text
    • https://zakazspbwatches.ru/upload/files/lapaboxivasup.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/44542440636.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/55379725495.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/83525393705.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/51781469241.pdfIn PDF document text
    • http://villkasz.hu/editor_up/11120203034.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/bozakejurusijel.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f98e2b5b---35462090407.pdfIn PDF document text
    • http://lawngo.net/fckfiles/bagixodedakavopajukotufe.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/18157751410.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/puvoropupedozatavox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=walking+distance+between+two+locationsPDF 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_off0000c483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC483 10756 bytes
SHA-256: 4c7053095c11df865d474e322ea5ddeb60097c0e949e2a8dc921fb178b652591
font_01_sfnt_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 18860 bytes
SHA-256: 42c7b80326a4543dd76ea13bc5ea2653b76a6d2dc397283c970790cede3c9744

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