Malicious PDF — malware analysis report

Static analysis result for SHA-256 822d7161fb330b09…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 04:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59b2c5d0424be75d073d7f06dc0aa652 SHA-1: e266a6995965489f34ea7e55b8ab190ad48d4acb SHA-256: 822d7161fb330b090da61995e23ec7cbc5c7eda0e5a6f3e99e73a46074fa32ff
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised sites suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/943842021.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/l1u1vob5vr38o8v8glmjv37eu7/simepam.pdf
    • http://europavloeren.nl/siteimages/file/vovuvusibogapek.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4569f764---pigepavuwaropufazepozopur.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9680d6c8519aaff8be7e114289070633/wexavivugawot.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/gb4oei2k7aamebgbqmviu7n8aa/jolugegosakexa.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/41e233bcdf9b78e4eeaeca047c687edb/59786597136.pdf
    • https://locktactyuma.com/ckfinder/userfiles/files/lixepapid.pdf
    • http://net-marketing.hu/images/files/38020606709.pdf
    • http://aimecostruzioni.it/userfiles/files/wogup.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b88cdf1df7---87010310031.pdf
    • http://klpa.net/userData/board/file/sifupunoxivifubo.pdf
    • http://ekopaczka.pl/imgbrama/files/zabujinowafexavod.pdf
    • http://thedewakohchang.com/image/upload/File/4813757226.pdf
    • http://scantech3d.com/files/dinekedovolawudagilo.pdf
    • https://thietbidiensino.vn/media/ftp/file/1657648166.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kln7rf5hnllk7imj2homun7i5h/57928260403.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9f3a2600e6d3a9a16583dec039c4e65c/40249998985.pdf
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/95b41d6fa3f0b70f4606d9f75d4274a6/43286579633.pdf
    • https://dragulf.no/files/file/gomawiwoketajexazap.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f40b8a1e05a---6269536205.pdf
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/68240381327.pdf
    • http://mopron.ru/upload/files/54573795886.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/cafjvk87pfdbreu80075qrspj0/79943391419.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/7632136030.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=50+mph+to+kmh
    • 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_off0000dd21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 16792 bytes
font_01_sfnt_off0000f533.bin
a814fe67ab3516d584fb0453c2d9434946163b43119fc534bfca90ebf9ebb6fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 16320 bytes
font_02_sfnt_off00011f04.bin
bf3949c87bde63d57336aa267353fe1558f6b6a0c31ddc2f94d023c4d091dc3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 9964 bytes