Malicious PDF — malware analysis report

Static analysis result for SHA-256 a840ca629fb74d12…

MALICIOUS

PDF

71.6 KB Created: 2021-09-02 23:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94436d825edb8f0bf576e01d19fe0934 SHA-1: 64bf3c7b30599cd44df71477765dbce3172038d5 SHA-256: a840ca629fb74d12ba4dfd6b540ca2e41d769e361b789f706bf95f948978028b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be hosted on disposable or compromised domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://basyapiemlak.com/yukleme_klasoru/userfiles/file/59629599017.pdf In PDF document text
    • http://jrpst.pl/userfiles/file/89557874891.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/suzegavogixuzojunutut.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/karirurikoxar.pdfIn PDF document text
    • http://palami.by/images/file/82475333890.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/zapafezigomavipod.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210828/files/20210828163450.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/revavipija.pdfIn PDF document text
    • http://ymmicro.com/files/files/22863710021.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/tejp2s3fo78bvtgvhl4gm151eo/93961126527.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/rd55gvuikto1lq2o3iff1jpeup/832223445.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/cc063e12272e60ab81ddeea9aa980f30/18103985001.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/48fp93np4c05jc73rig2cd28i1/22709873354.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b205205f2---57161374476.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/xemoratejunesoponasipa.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/49254530229.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/14253492649.pdfIn PDF document text
    • http://one9five.com/userfiles/files/42594324307.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/17047270888.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072935a7770a---jamakorepelazafigidazowog.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1d3e4396990a6a06405d87256ae3fbe3/sexuvipumolazokik.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608905141d46e---gafamuxifilakajeji.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607620938518d---11211526905.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/jomuzitaxetabetebinolib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=rite+hite+doors+pdfPDF 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_off0000b881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB881 15956 bytes
SHA-256: baf6b091bd05e04ecb077c4c78af2bf7028f4b451dd04692e0e4ac012580e468
font_01_sfnt_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 10328 bytes
SHA-256: 60886c8e72bb4fe862652ab4056435749f632aa89f31a0e1b6393075b9fdd052