Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a83326da844896…

MALICIOUS

PDF

86.3 KB Created: 2021-08-31 01:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d877e7f171918cc4fbc69d6bb3494d6b SHA-1: 49c7e0c97a7ea8da52efbf8ee532cb9044fa5279 SHA-256: 52a83326da8448965eecaf87de35c7efbbe46271edd5cc774cd73d8271981826
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution scheme. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=the+importance+of+being+earnest+play PDF link annotation
    • https://myphi.biz/nbloom/fckuploads/file/kojepizagin.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/pivixaveja.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9b9e46bf5---29825019967.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/49226307810.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/67662811996.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7242c5395---74011403021.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/daxawewagiju.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/kasobakojamufitumigiw.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/kavexemedadinewefajediwo.pdfIn PDF document text
    • http://hms31.ru/img/file/josenuvefozonivavemuba.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e0c635b64---86447818846.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/wuzijoxevaruzozi.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/vukatipubaxuwebevivizebun.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/narapeteketinivo.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/pepega.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/90521026302.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/pinedumede.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/54696904812.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/pg4etk7ir8gve3ra8o3ba6mpp0/xadija.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/lamomara.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c89026c554d---72595561596.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/nokojola.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/24073034501.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/ronedosi.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_off0000eb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 17752 bytes
SHA-256: 283b59a8768afc75b15384cc64f30c5f56e7d77b961cd10a38b53424d91c1bb8
font_02_sfnt_off00013139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13139 11144 bytes
SHA-256: b96f2b25ca63b5019989412462ff7d42bc88524300143a5fa6eb3b82d2aaec73

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