Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e70f82796b68c84…

MALICIOUS

PDF

97.9 KB Created: 2021-09-07 00:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a654c980a80e58e2bd27a42557251aeb SHA-1: 2267f7d892bc0082d247e045f4d6dbd965e6d25e SHA-256: 5e70f82796b68c84379558c052592bdcc926af6822336914c64f78487b5bb3e4
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support its role as a distribution 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 http://carrozzeriabosini.net/userfiles/files/56280621064.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a1980ec75---seresirepogabipuxej.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/6lv3cn0do2egrj7cr4otndfm69/zebisig.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/0ee2fa74032066c5fe0dae32ca356f75/50283742202.pdf
    • http://ministerium.pt/files/kazavovetesevu.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e9590d338cac656d9337c48b6b65aa59/75029014473.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a2f9cd7b3---94986079457.pdf
    • https://www.nvsrolko.org/ckfinder/userfiles/files/98612994721.pdf
    • http://ablerexthailand.com/userfiles/files/bixig.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e50a8b0200---wugipuz.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/54520c7e9b1f11a0770c10d1df939d8d/25062429550.pdf
    • https://makenie.com/upload/files/28747179276.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a3b14aeb---86027586775.pdf
    • http://anandtouristcorporation.com/uploads/daveruxalafajum.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/491c535b1f135d806e54f4c70341f72e/dewuwimazalawi.pdf
    • https://artlabjo.com/userfiles/file/42462982377.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ed734d758---xurogemanodefarezuv.pdf
    • https://777mto.com/contents//files/runivugenakugekugabizivad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=model+airplane+magazine+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_off0001198f.bin
27f2d12cb4808d2917c106570388aaa17f997c2fa95883f73869dc3259e9096c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 10628 bytes
font_01_sfnt_off0001318c.bin
e76e7a6020d7f8860e1bf0235dafe5299d3338657904afba22609c77451779bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 18524 bytes
font_02_sfnt_off0001624b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1624B 16792 bytes