Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5ca1803900f0e6…

MALICIOUS

PDF

87.3 KB Created: 2021-07-02 01:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 741e5353209aaab9759c40042a31ec24 SHA-1: ecf699f67a5fc7f83c35d53b54f53b72fa5921cc SHA-256: 9f5ca1803900f0e649b9108b2f974cb432ecce7ba875c4b2d2eae812f1e378fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of external URIs and a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/065a30a985648cb9948b9d3ac3ebe74b/bavoritazafobonisutefukam.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b11f48687f---69544665791.pdf
    • https://dienlanhhonganh.com/images/pic/file/11000006770.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/vovozofokixera.pdf
    • http://chobacgiang.net/webroot/img/files/bosuxuneja.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc9d3670b---pujilusegabulakozijaweku.pdf
    • http://thetestmag.com/userfiles/files/tekaj.pdf
    • https://m-astar.com/UserFiles/files/77098834588.pdf
    • http://daiichilogistics.com/uploads/news_file/rodojiwotal.pdf
    • https://italvaping.com/file/bojibutinol.pdf
    • http://gaziogluenerji.com/images_upload/files/tajakusazapara.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b390023de---88119125164.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/da73bff4f22f2bd0bd221ad2ee9f432e/41597278171.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e8780c85---70917794926.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/5rm2aet5vcac0oqsvhoduh5l14/91583224291.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e3077929---nizojadutiliwovok.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e2554c26c07dc4b96485e9601ba4b478/durobukaxukebuxabov.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e803ae5b3---pisuserifumanasot.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160806cfb403e0---xeramuxewo.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/555d6df50a15e53b792ca4c682e7d602/zapiridudib.pdf
    • http://www.bandungmesin.com/file/83860100981.pdf
    • http://apexibd.com/uploads/fck_uploads/file/67344774812.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9015cc509f60c1e97e2bc38cecf5b7f6/fajudekifopoja.pdf
    • http://apcmagon.com/userfiles/41478629034.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/dcd4b353651a7366937e0130759e1571/87363164688.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/93904092204.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=driver+parallel+lines+ps2+cheats
    • 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_off0000f1aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 16792 bytes
font_01_sfnt_off000109bc.bin
e6f382991c87e36f67d391629d3e731978b67749fd297e9c28503db87da2d244
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 17616 bytes
font_02_sfnt_off000137b7.bin
1d0e65d75f28b20421df0a1ffe060573eabe9c5b1b72e83262791d0d09ede92d
pdf-font-stream PDF embedded font (sfnt) at offset 0x137B7 10540 bytes