Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff5b2136b65da02…

MALICIOUS

PDF

104.2 KB Created: 2021-09-03 23:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 280755bb9ae09977fdec935e62c34067 SHA-1: 104677d8a9ef7c6946394417a506250e6758d867 SHA-256: fff5b2136b65da02df7556e33f76d54c3231bed19a1f9c133ec803805f3bd885
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The presence of numerous unknown URLs hosted on these compromised sites reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610894c3b5c23---42837310598.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b2cb1b2c3---modagomawasegotejusenili.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609869333e204---wovorinaninimaleb.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/jejawunubigarexafola.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/vedapigalupup.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/80824958142.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/71711341934.pdfIn PDF document text
    • https://akemi.ro/hirek/file/fejurizafivakod.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/mopepikefawon.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdc5783cb---zomodedewelopufawijiwunu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160925fb904fc0---1478737819.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/kebifekisomavijeb.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161131bff216c4---nogeb.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd42ec4995---savuguwobawajuv.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bed64a0038d---43594222221.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/42086872028.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/53312740621.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/25319718315.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd24142b934---7504806025.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/20174316030.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbfcd57d8e57921561d45dd07ef38add/zagidurowikulowavilivo.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/judena.pdfIn PDF document text
    • http://neonyazilim.com/images/Media/files/zuxezawoda.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610a759e441ec---57980509603.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b1749e4dd1a9ae93ea651afa1e507d3c/fugogixa.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c884f74ece4---34613023357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=holman+katha+sinhala+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 2000 bytes
SHA-256: 7c79af7b14267031ce06f52da3ab4922fcf389d0341111b4be3c50e57c3c8a55
font_02_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 17604 bytes
SHA-256: e246f8bf6fcd8cb798235ac2ce8ffff24d7b5c87af6aeeb45a7c40f2558225e4
font_03_sfnt_off0001334f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334F 10700 bytes
SHA-256: d8b1cd1264af92e53bb776b67d15b23a12350d81e0820d71825429e5b55577ce
font_04_sfnt_off00014ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA4 27880 bytes
SHA-256: 35b545bd605b7dc50ba447f44babe04279b7587f202a4e753cc8124609371376

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