Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3f6a122c8abe76…

MALICIOUS

PDF

91.5 KB Created: 2021-08-10 23:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ee00556d6d835aa900124ef460ee2569 SHA-1: ee4e71f15867be20a1b302cfb2482c4cbae9adac SHA-256: 1f3f6a122c8abe76d3e23c558caaa63b7ebf674e813e618c29749eec11a0ca50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or phishing sites. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious intent.

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://kd-council.com/upfile/files/16030563671.pdf In PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/s0dp43p181p4o5gvlgsr9vpu3e/nolonulavekalogifagivuri.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610bff757f68f---67828955266.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/wujikipiropajapatig.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/84260429516.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b51901d18f---varufiv.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc812051b43182557639ffca9fc7f400/53070733468.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610bcef2a40fe---rojebep.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/11962023460.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d6037682bd7eadb0bf89be6c71867f91/satozoxaniresatumame.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1625975bca8a8b1646039209d9ee2a79/dazik.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/2991bc6dde28d3bc2d5c048535aae1cb/ragazom.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8257566b7---relarepuvadulitaxubeze.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/favagekezojik.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/17029254837.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/75289783153.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/62157312748.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4081c158c0eb76d589114daa842aa3a4/zirew.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/47325081933.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rmmbgc96vjhct10udrdsu4jclv/liwimuziledoxunelo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e117fbad559---14062220353.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/denepineteditu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ps1euc6rtg926ad6spfo47s6g0/78560880147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=imperativo+del+verbo+chiamare+forma+passivaPDF 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_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 20520 bytes
SHA-256: 235d3e209115185b24396696b875ce88f261024302a0ea623da60a53871f0139
font_01_sfnt_off00012efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14712 10936 bytes
SHA-256: 949f1c0b0f1bda3e2623d3884c0d1cc4e33129f131aa84e072886b55d980b5a0

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