Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9042527dd9f217…

MALICIOUS

PDF

86.4 KB Created: 2021-07-14 02:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cf3fb871667bdc05070c8f54d61ff87 SHA-1: a75d905c900c1608883bb74100f58a0ea2257221 SHA-256: 4a9042527dd9f2173d46d282236da87b134772277b4df9085824c0db26c70da3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the links indicate a phishing or malware distribution attempt.

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://allytemp.ru/uplcv?utm_term=skachat+car+parking+multiplayer+chit
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c252d176---witasonipixu.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cda798255---zexatemowojo.pdf
    • http://avonsteel.com/UserFiles/file/81318734089.pdf
    • http://radfordhsclassof1970.com/clients/878146/File/40935672781.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f44cdc268---vomamawuxotag.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb8cce9e3---dexufaru.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/85483703351.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/74852906359.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/i6pcbjt20obja5qvt8s9b0ctiu/ninixoluzipazotosaripene.pdf
    • https://observatoire-omic.org/documents/file/85310499768.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/tr933r3luuv3jnurm2veqrdul1/lororaxire.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72b5b40c6---rojab.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd347c02ba---nekutanulivufe.pdf
    • http://artkulinaria.pl/sites/default/files/file/89229819819.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1nc9sj2l7rba7ssjbrqrr6mgo4/sabos.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef21a1820---gefiz.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da8ecc56a1---vusorukozuzifiduxogajik.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096797c1994f---dokalizupo.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/27771529132.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fed41a61c---58501637559.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/k51amte2li7kj0g1k20pcsjcbn/90269057219.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160843f773cc1b---bomuwivalizuvikarovuf.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/051f7bfbbbc61a0371e36a1088266e2b/46187917777.pdf
    • http://robwalker.net/fckupload/file/89299544413.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_off0000dee5.bin
3c415504760361acd790872b93b55fd9e50806c7105c4e3f3494ff88c115157f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 23264 bytes
font_01_sfnt_off000118ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118CE 16792 bytes
font_02_sfnt_off000130e5.bin
55586489e410c8d23b1a004712a54cf3406d2370cd5efa7938fa5dd98b0e82ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130E5 10916 bytes

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