Malicious PDF — malware analysis report

Static analysis result for SHA-256 531403c88148820b…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 07:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 090262a14cf1efb4e6af91fd83e892ca SHA-1: 4cf08a13bb0f9934c1eada491b0d65408fa59ffd SHA-256: 531403c88148820b40c990adeb179e2a15ce20e8d0db8d6a784c57668d8e30a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://acupunctuuryao.nl/ckfinder/userfiles/files/29298284301.pdf In PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161382f0665c43---fililoke.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/99279024841.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/29116750124.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/bakazapunoxewiwo.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/kuxixelajed.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/66381198543.pdfIn PDF document text
    • https://forssah.co/userfiles/file/39354082408.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/606874949f310d5724503bf94cd09c69/28027000852.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/pazovonexasakigimapebere.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210923_CF1B918A884FCE56.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/lepinod.pdfIn PDF document text
    • http://parfumland.sk/upl/wakobik.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/84002029149.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614670b853497---bidufa.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/mevorovabetorikutuzod.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/wanemewopunomog.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/sazenufaxagadefopusep.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/torizanujarumezafojuwu.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/fesedomodazusux.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/xanawogozebolikizesav.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/zadekep.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614583be366a7---94490619046.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/57289426054.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/47946779145.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/15497219630.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f7856a0b---repivisunumiguvedigoxaw.pdfIn PDF document text
    • http://humanlitech.com/files/files/96131526794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+pin+brute+force+termuxPDF 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_off0000b7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 17368 bytes
SHA-256: dc307043143a0bb7ace04eb30b3d0782e8bd0d421177453172b6c4c6d9a166c4
font_02_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 10728 bytes
SHA-256: f0c31df1302ad79e70169efb12143ff38c9c42e964afa915d975aef5b079889c

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