Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d8319270a73a01…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 17:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00ccdc5d7fe7768c09e88772b453c99d SHA-1: 5afe43237ca9ddf54f04e48011119bba0d7bb78b SHA-256: 97d8319270a73a016fc6c7db38cae443e113862c80f791da69594bc929a0b767
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=raycon+e55+manual PDF link annotation
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/34e7a1a3faf2d548fa131da9566ae8ef/vapidukuzorabalaj.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7cbb00a3d22521fe7cbe03f64db0dcb7/bekilusotekogom.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c8c6dcc6421405a76c3bf4dddac17b82/30067781535.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/28674538066.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/xivugure.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/621290b22bb5e2d9a63660bc32e8675b/65987869822.pdfIn PDF document text
    • http://cosyromania.com/media/file/repejapapubit.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda980c4ec---56055025217.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3ab228ed---21885921263.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/wixolukuk.pdfIn PDF document text
    • http://gardatrans.com/content/Files/gaman.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1d53749256481afca152ceef53403cee/gosuxefogamelikogavune.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/tokaxinadoroxinaro.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/siluvipojozozezoviraj.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/96185147301.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16111f70a006cd---66780118220.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/xosupedotuwukuxavifod.pdfIn PDF document text
    • http://brlairport.com/images/file/xosonigirufarixut.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/8812352829.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160d8312c0b277---xamoxume.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/5b497b7f40b9b86cf5ee581942789ec4/xapiraposesurotaxovowo.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/deduvibikixav.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/25463168111.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a042a324---xaxexel.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16083882425f24---nirunotosipofanuruw.pdfIn PDF document text
    • 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_off0000bd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 10324 bytes
SHA-256: f6e4eeb914076b3da28a367d068545ce2ba0c5960eeac921e16fb182ce6d0b1f
font_02_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 16392 bytes
SHA-256: af1145650a8816086d872f23ac8cc48b1906cb351e0fd3bd190f6effd9b6a16a

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