Malicious PDF — malware analysis report

Static analysis result for SHA-256 95062a4a64edf7b5…

MALICIOUS

PDF

93.0 KB Created: 2021-08-04 21:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3c81821ac1146bb5ba288be7a3ecf19 SHA-1: 61fc35404afeb15a3d45117527aadcce2793f3bc SHA-256: 95062a4a64edf7b5b30a67b7d7dfb0f829561cf6e22d28209890504388d5bae6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://pressvaluation.net/userfiles/file/faguzukerefetixufibije.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823b46d772c---18652289641.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b18bb5bf5e927c6b770e32d1fdcd9b2a/xoziruzuwaz.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/174ca3bc54db314a7f2bf37bcecb0b02/21525221472.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/7640953235.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b346fc6153f---xonebufopevugidufifatisa.pdf
    • http://lapenya.cat/imgjovesnaves/file/6502161284.pdf
    • https://ukmalayalamnews.com/userfiles/file/42431302040.pdf
    • http://stlukesmn.org/clients/17773/File/davuxe.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d533e7cf9a---xadubizawafewefikakaju.pdf
    • http://agriturismolionsfarm.it/userfiles/files/86672891818.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/83ie949pakce5vtoanp178m196/63307684374.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/37649510026.pdf
    • http://www.sport-konyv.hu/userfiles/file/xobufakelivizaramutadug.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c28dfaf247d---36599077356.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f58ea6843adaf8732df63cbc5b02dd87/25745222883.pdf
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/86280918146.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608a221be3724---54402030051.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f36c2966f74b7cb588edf5c3ff212c2e/maxapokuduwo.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c96fb271fe014520cd427b1f9d080a5/10493496672.pdf
    • http://kipia-nn.ru/userfiles/file/55489708197.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/povererixowemosizexeko.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=read+theory+reading+comprehension+assessment+tools+of+persuasion+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f91a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 16792 bytes
font_01_sfnt_off00011131.bin
40149dac56f88487bb44054167b99325f8863fd5f9dd2945c21e171fca3ad478
pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 11412 bytes
font_02_sfnt_off00012bbc.bin
bd516add5ed66fb1cef3e8833f8dc95a55c3a646de538e30e95769ae85466dc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 2600 bytes
font_03_sfnt_off000136d3.bin
d7c925780338bc043cda00ed71bd899acae7d9cdab11961ab7f803fb5fc7f2b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x136D3 17212 bytes