Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62e56c6f7e52299…

MALICIOUS

PDF

85.7 KB Created: 2021-08-18 13:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 344fc931e8c391f1bc3c58084cec9435 SHA-1: 9cd9cd4332dd932654c161f74b6aa9352325cd87 SHA-256: d62e56c6f7e522998c3d9579bbd9f0f0f4880b42d3c2db2cd50f1a48ba5b559c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8v43562rul14894g1v4l290fl1/rirovamepi.pdf
    • http://syuncyoku.jp/upload/file/zafezufotana.pdf
    • http://birnagarcollege.in/userfiles/file/10008773941.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610676a850e59---76755101650.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/4447937004.pdf
    • http://haciogullari.com/depo/sayfaresim/file/gifixigegosavuwugalunijat.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3da56e73c2c8a9261f06ef44c773b995/magivasoramikesoner.pdf
    • http://amon-syotengai.com/userfiles/file/winukurunu.pdf
    • http://4reality.cz/userfiles/files/72023187522.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f28270d737---56905429076.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093b07e782cf---tokopuvigak.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70105a29d---bazuminiwulomudores.pdf
    • https://foundryindia.org/userfiles/file/tirorevon.pdf
    • https://joinvita.com/neu/userfiles/file/23129825007.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a655643602d---29159681430.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/tolabuk.pdf
    • http://rauvuonsach.net/images/uploads/files/34588368933.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f2ed1f694---28970950454.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/11791278509.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2kl16qiamllou35pj7p834ongv/kelabelukupe.pdf
    • http://teusz.pl/UserFiles/file/sagujumewetu.pdf
    • http://automotiveenergy.cz/userfiles/file/gezokawelamujuzutiritug.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd0c7f762---jinuwavijupori.pdf
    • http://doudou.tw/userfiles/files/nufudalax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+heal+a+broken+leg+in+ancestors
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 16792 bytes
font_01_sfnt_off0001029f.bin
0d7c9564e8fea6a656fde3329fcc1c6ab60da44b3715b51443c27851cd5f9b85
pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 16444 bytes
font_02_sfnt_off00012d26.bin
97ab01ecabf5871cfbf8f5f3c93037c75e9ceb9b7c0702b82d2ffbc2d666325d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 10820 bytes