Malicious PDF — malware analysis report

Static analysis result for SHA-256 a393ffb76d928464…

MALICIOUS

PDF

187.6 KB Created: 2021-07-25 20:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98e84c0a5818e8fe9fb9d691ebca64ab SHA-1: a11b4e670f1a565921328f53f10a65a9abdb908b SHA-256: a393ffb76d928464462a432a302cdc8bc7df4b118c47e61e3bdc82dac3b9c9bd
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9655

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 http://buyyoutubesubscribers.com/ci/userfiles/files/wamikanekokijadoruxuku.pdf In PDF document text
    • http://classicalgardenstatues.com/uplds/file/gavutegidakulogapaxo.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/73238129295.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/20041613153.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/gilofoti.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/58345834259.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/zufolikeda.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ffaa27d1dc91f826af449a6c4a3b49b8/28706800111.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/2cp3vf1v4empt3bkb6qfpk47b3/98239854124.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082cac9d8f96---fezikunoribowapi.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/8132934567.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kafiliritidef.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/717b0fad57d0e7065f9c1fe42575a458/71983682820.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160746adb6405c---nuravikorisedok.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becbc61b971---4319536677.pdfIn PDF document text
    • https://ancoraeducacion.com/images/69241663981.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/taxadatanovimujo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160758d394d307---kerulujev.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a0861a714e5646bedf7411c3f0fa22f4/mapofelejerefaxasejom.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/82342e8eb9f6a4f114b686bbaf2db3d8/42730644856.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/86008971277.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c9169a1f---rozomitodaxo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6a16efbd412a9d377c7d3793a83090ae/10296092053.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/52227731141.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093cf36262f5---piloxubivuzobadozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+long+should+an+anadrol+cycle+bePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0002badc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2BADC 21472 bytes
SHA-256: e3d679e3e0023ba37d6754b8084ebf08ec864634fdf11977468f423a19dbaac6
font_00_sfnt_off0002523f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2523F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00026a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26A56 10892 bytes
SHA-256: 3c5524f9a83e311be9eb3b16b3cdf38451662513269f319527d49aae472731da
font_02_sfnt_off00028356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28356 21728 bytes
SHA-256: 3e55edb3e6e5fdd8512f78b6118d67d7efb5efc964d64073dfed8ede9502eabf

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