Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e01065938624e79…

MALICIOUS

PDF

83.5 KB Created: 2021-08-18 01:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 61b1b21f4e6bf8f72c25128a9c60963f SHA-1: fe09fd99918a753ce1f10bbc74d5a5154595100c SHA-256: 4e01065938624e79f97f690026c8b617eeb7d1b504be0871b85d9b8d3252fd39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/afa5c380fabf960f02b34a32b6128d37/74855048019.pdf In PDF document text
    • https://lionkingbali.com/uploads/file/panegapiwijexugudisame.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/14929263624.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bd71fd6c202154877ccb6e5dc07341ff/64032689969.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/76845619462.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/j7oprqv08djkq18frs6b66qbou/86232294967.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/suzuzazitomumako.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/jowikuwuxosatawub.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/745c595e37772a44e06083e398fc78e8/82232181641.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/618d8e52daa342a5d6bc825bf2de1efb/1894839281.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/zuzapanuvurimadomaf.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0d10qamdmi29e413mairk4bo4g/98981469668.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/17363714193.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/kusowono.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/11123455508.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105587eab297---45742326613.pdfIn PDF document text
    • http://simonide.org/userfiles/file/nafejomibanumevavozoroja.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/83f344d3fa19fc6a857a03d4069fd085/81800576015.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/sivowezurixixalejuwiruzu.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/tapukaxigovene.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f88ca465a6---32389763590.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/sotuvusavox.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/bafituwinix.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/72625411012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cual+es+la+diferencia+de+carta+formal+y+carta+informalPDF 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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 10884 bytes
SHA-256: c91c366ec825020abcb8b7abcc6eda84103580e01d9eca2ddea5a36f9b4f128d
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 17344 bytes
SHA-256: 876f8325217a1f6f9af0ce8af6107230b282efda03378513a4e3e20068415e69
font_02_sfnt_off0001252b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1