Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1c4ae71290785f…

MALICIOUS

PDF

181.3 KB Created: 2021-07-03 18:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9e9bcf3c3a4c946651001df2ad84969 SHA-1: eae2cda1bd52f707cb22bc4a0054caa4594a9e5c SHA-256: fd1c4ae71290785f51ae649f055ccc51fa0882d838a3e850149778060baacc21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=concept+of+open+source+technologies+pdf
    • http://bannhuaduong.net/upload/files/sepedesekibopisuligiviju.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c04fc881033---javaxewuvul.pdf
    • https://campermagazine.tv/public/file/buriniwutalatenakikibik.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/meab2v0nc64uhmo12viq7k3kg4/lakekikesoxikenezobas.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/79143655906.pdf
    • http://batiment-tunisie.com/userfiles/file/63831404510.pdf
    • https://advantagelic.com/singhania/downloads/file/gepifarakudodi.pdf
    • http://iaestedresden.de/userfiles/file/94687487388.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098bec37df3a---40824519292.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/3964986897.pdf
    • https://theatresaucinema.fr/uploads/file/siwilozexesezetagukovu.pdf
    • http://anthonyvienna.com/sites/default/files/file/maviparuboris.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/60pvfe369q8r8bg6jotm1dsdh0/61356658477.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tvt3ctdktmbk3nrcgftteraflg/dibijibasojadizifoxodiw.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/gobukapabubefuva.pdf
    • http://rolmech-strzelno.pl/Upload/file/xuzinozefutejave.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/86ddb635a4d93ca0fbc3943e4f71788f/53375145868.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f310e97cb---sorokuwitusulaniw.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d995960a15---jifiregaruniniviju.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/61447df21c61a2846d4114a8e7b6a809/54353802520.pdf
    • https://isosklo.cz./uploads/96842497329.pdf
    • http://aj-logistics.com/stock/userfiles/file/42175704364.pdf
    • https://media-get.ru/userfiles/files/25093696642.pdf
    • http://adbuilder.at/ckfinder/userfiles/files/74234576674.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2cecdc9d6a66b27650bf4f8987c1a71d/larulipejufonub.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e229b9859b---44343616727.pdf
    • 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_off000266eb.bin
bb5bd9d66beb7a834f51c7becced6229827f1a8248610738c79539df0cc6b58a
pdf-font-stream PDF embedded font (sfnt) at offset 0x266EB 10868 bytes
font_01_sfnt_off00027fbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x27FBE 16792 bytes
font_02_sfnt_off000297d0.bin
81e06c96af9e53d3b72c5b0ef7d085af514e4098fe3ec7c41890a060a2fee39d
pdf-font-stream PDF embedded font (sfnt) at offset 0x297D0 18096 bytes