Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3a012b8af7421b…

MALICIOUS

PDF

114.6 KB Created: 2021-06-29 04:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 50c3d240d0bc85e40abe2e01792b4d0d SHA-1: d124288e7f5d53a5f1fc1ee509464fb6428a9508 SHA-256: 0f3a012b8af7421b7824fbc3355c7556feeb61af9e3bffde67eda9b55212bb0a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing additional malware. The document body is heavily obfuscated and appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762791905e6---vomevevadonasepeb.pdf In PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c658423334---7111644874.pdfIn PDF document text
    • https://daismene.it/file/37435285975.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/lilalujijajaroxebegevig.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/22qa049g1d19a2fjhedf0916oo/370613172.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/289a9ce1ce186afe447144e35d0b34e8/88519366822.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073c43f8732a---jelutavovaraxezilokud.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/76174af5a1b92715bb9b53e1814c1b11/39986695771.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/2orkkbjqmvmvv940d566pv83lt/nuvewavavojewobenoxopigi.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/xekibitatoku.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9of3vta1ocs7kc5dbfa28boau0/dekib.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160785868efe1a---fulok.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/gafuvivijogajuku.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/62640b5b4ed737acf0b6401e219d9343/nesarepozifozo.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lenuri.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbda80e9ae---86404662626.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/fjc6a2nlkoh8p1o7i7lddj5la2/feloxupipo.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/buzozegazamunopowe.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b246e207439---jisebabimifelixevivag.pdfIn PDF document text
    • https://area5srl.it/file/folotax.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e06894ae3---56666599451.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/pevavenatedav.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f497398bfe29678f2ab25977fd6ee960/48672922168.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/gowukob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=prayer+of+salvation+for+someone+in+a+comaPDF 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_off00015e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0D 10676 bytes
SHA-256: dcddaaa4da47cc6761c6e906f3e6f10b0065219e18681c1f585502937ecb211e
font_01_sfnt_off0001768d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1768D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E9F 17644 bytes
SHA-256: 942fb728515162ad4288b11ca399f38af4f65a7a9c6fac2c25dc6bf78e9582ee