Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f97c6a22918736…

MALICIOUS

PDF

91.4 KB Created: 2021-07-24 20:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a0d6ab133a66757c1058abee3a002302 SHA-1: 2764fc3ca9fa0763392937d5602fad9641ac1530 SHA-256: c5f97c6a22918736c865f3aa76964db59231c6c65bedf53446c8431bf564e47b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of multiple external URIs and the overall structure suggest a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9244bac3458a84b5acde7b9e3f7002d2/6852891985.pdf In PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/goxuladerepawiwokitafigu.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/naxevuremur.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/a95eorsju3lnqpp8m9j5jrks4s/volumibopewotupenijijami.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/54b2eb758aa04ae4236e75c860af8de1/29155732618.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6d2c94e9---27600338462.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/75714800601.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/pejidomatojipija.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54fda300e7---koxinikasixuvavafeduzugin.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/97324630950.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070efbd7e0b9---gukogilojukarelomolezepug.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/wovofamadoju.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/1900a15a2dd6fb519223ee47695b4de2/67551164875.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f4b1ee699---dufifuxonimedeloruvasu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ttdjp2d3ip4d4asqu57snl56hf/xawigeselowaxuvuze.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f872bcaba5---niromegiwupotaze.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/xulor.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1f3ca366f---dikejanilekaxodesepobuter.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad5c1432b5---88323688473.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d92512072d849e15a973485e10955436/pipatevetofikijifubape.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/59222771083.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/mugubimekusibusemezegu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6e9a9128b---bivifokupogexuwabupivig.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/47523171505.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210608230336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=music+theory+grade+5+pdf+free+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 16744 bytes
SHA-256: d07ecf830b8a508b7a2cc825d85598e09553a57ba8ad925c1fe3a91df0f35fb5
font_01_sfnt_off00012af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001430a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430A 11328 bytes
SHA-256: 74afbec48549134c4734f3d8f688e37c66e0871586656d8e342a23ce65e816bf

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