Malicious PDF — malware analysis report

Static analysis result for SHA-256 c174b6e88edebb88…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 14:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4492be06f23fe2022d1dce2da9423149 SHA-1: 6074e47ff09cc5f82f5effc1497438f12f28cece SHA-256: c174b6e88edebb885b829d3cfbd8ac67426de04f23c7171d34f6d3c5edd08f45
156 Risk Score

Malware Insights

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

The 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, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm on potentially compromised domains strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gibisch.com/files/files/76716058489.pdf In PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/23732379139.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/52333120082.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/34381959662.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/dixetipaxegizejepivemiz.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210514215833981546nn4tor.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/tarigiwidagogik.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16226259271146149608.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210703_15526.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/laxanup.pdfIn PDF document text
    • http://somogroup.vn/ckfinder/userfiles/files/341438063.pdfIn PDF document text
    • https://equalland.com/uploads/File/fuvojagagutut.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/73845155234.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092199cd14b4---75598527307.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/45070001517.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919ae36f89---56863864998.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/gabodatejike.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/96848202114.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/13564295531.pdfIn PDF document text
    • https://tepihtrava.rs//files/ligafovu.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb3705645f---1543304426.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da9c5cb3e2e---vifon.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/121958b20c2b06b2c49e5d6007cb6c7d/32524896986.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/a9479fc6bc7951214acee89e632ecd19/1724266107.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0db847b9a04cc380d5d93caffb2591a8/maxelijujemavanufozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=concurrent+programming+in+java+pdf+downloadPDF 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_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 17876 bytes
SHA-256: 222f16ded0299e01f830800a0dc504520e648b77a90a06a86035812aefea2d69
font_01_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 11208 bytes
SHA-256: 282bc0dd2a58221710e912585ccf5599fa1a14947ac028edf3e37f5588c8c7d8

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