Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e9531a8ed00eff…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 08:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c4f597bf721aa57edd33d9c98b9b7140 SHA-1: 3a310c6782a07bbc2c27586263511c63344ccb67 SHA-256: d6e9531a8ed00eff67abdd21d16805952bc640928b8ee4802b14070f6ebf93a6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to other sites. The ML classifier strongly suggests malicious intent, and the presence of embedded URLs points towards potential exploitation or further payload delivery. While no scripts were explicitly extracted, the nature of link farms often involves JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=parametric+cost+estimating+handbook+pdf PDF link annotation
    • http://huonglonghotel.com/uploads/image/files/natokufin.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/tejabogugudozip.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd309b3a2c---28672378928.pdfIn PDF document text
    • http://clingac.com/d/files/zifekumoxafenitajavunif.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021081708131834.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/16499634897.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/vasowiraxowinedet.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/54886834071.pdfIn PDF document text
    • https://2acontractor.it/images/file/80790230131.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fo3jehmn7nfl4neo5qn4hbtjd/dudat.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/82705013593.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2c5291a59---16972125839.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/75778328515.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/56e1bbe3e925a8ce2178a8cb154b864e/fojewokuwapabimokezegis.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/vejotufovakupu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/sm4mkfhvrgo1siov00vhdmk5du/zubelokix.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/60637759762.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/72079064630.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2f1a07e6bab3eadff6596e78b943ca85/34481802795.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/fofafepumarar.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8c64efaabb92e66213c9ad96f22bc0b3/vufalijezewipozere.pdfIn PDF document text
    • http://elitvorota.ru/f/file/dadosivunimezuzipofo.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/1s2lb5jaduh64ls834q4rucfpu/40966232024.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072137430713---79084227252.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1faad425edba978067c5854eefe73dab/89955815527.pdfIn PDF document text
    • 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_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 17040 bytes
SHA-256: 61844d52f56e5f6d5f66c88270e40e5c4928c465900ef2b03be5c328aa30f75a
font_01_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 11256 bytes
SHA-256: 67801ff7a2e9ace2591798bcbd7b96e5b4069a73ef33af8bf436f087585007d0
font_02_sfnt_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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