Malicious PDF — malware analysis report

Static analysis result for SHA-256 899bfbd155ef85f5…

MALICIOUS

PDF

70.6 KB Created: 2021-10-04 16:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 31f55ec4805e112df210f3e70cea98d8 SHA-1: e409d0d79842f3bce0924bde324180ff48b78ac5 SHA-256: 899bfbd155ef85f577934e6a95a57060abd2df0dd87e95f4247802419879a654
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=hourly+non+exempt+meaning PDF link annotation
    • http://bm-shower.com/userfiles/files/67136053759.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/jupadagixakazekajam.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/46495121778.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16150aaa85275b---76648936817.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/soviwijafefoxudifikudavuf.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/kasuxisusafuroli.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/vamedifapipinilodomijas.pdfIn PDF document text
    • http://skupka23.ru/upload/m/68830701885.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/30409134729.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/bekimuv.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631538787_ba88b79035.pdfIn PDF document text
    • https://yasacompany.com/upload/files/10594625171.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/84064943421.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/81019182604.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/90959708859.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/zufufotakorinekuxaliv.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/ripozubaruzerapi.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/jipaxugagumaxawetulu.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/tazejexomil.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/cec05eeac3a59f473a23d810db0987b7/lusud.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e5c88ab4221222881c81e9855ca695af/muwetoxex.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/sozejelegisejutip.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_off0000b46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46D 15708 bytes
SHA-256: d89a16e24cc342ad41edde30aa962cd7f649ab6dd9316f77638844675050f59f
font_01_sfnt_off0000dc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC81 10732 bytes
SHA-256: c7b199c057dec244b2b8b4164d172cbdc19719dae16c61eb0a4d89e417544ac7
font_02_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1