Malicious PDF — malware analysis report

Static analysis result for SHA-256 c480254d2cd997a8…

MALICIOUS

PDF

73.3 KB Created: 2021-08-14 01:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d8b63c7d0b1790d3aaf1d54ad31c8af SHA-1: e2740fc84f84a4bf44d2e4ccbbd7e21dd61cfda6 SHA-256: c480254d2cd997a8033c3b6e8925c6369059a434781d6493ef1fab9f09eb2853
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple domains, some hosted on compromised CMS uploads. The PDF document body is unreadable, but the presence of numerous external links suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/5915888701.pdf
    • https://stonebuild.bg/f/uploads/files/tidufij.pdf
    • https://tiemhoahaibara.com/data/dulieu/files/luvusuvekafugesikevo.pdf
    • https://torbay.ru/images/uploads/file/76160224236.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/80c87d91670a129a0339656cde0cf0d2/10421330213.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/4191a7bea490fd90197398a0db8fc234/putomikifaxonuxo.pdf
    • http://apartament-krokus.pl/userfiles/file/jorurab.pdf
    • https://serwisnawigacji.pl/userfiles/file/tanusugejuzumoti.pdf
    • http://vizit-k.net/uploads/editor/files/464910845.pdf
    • http://pinturasoltra.com/images/slider/files/21412991879.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6b9635d0---28007663901.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc739b6a4b---63274347158.pdf
    • http://studiotecnicolamanna.com/userfiles/files/63633270245.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/198opi3b38agpi4emdcptd9fg6/82896204471.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4a604acc971a9ec3a256ce442700ac79/2771278455.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6577b90cac---suzinirazejut.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7273bccf19---sijajan.pdf
    • https://aarhuskortet.dk/images/file/72601633080.pdf
    • https://cmflower-kkc.com/ckfinder/userfiles/files/webedadoposajokezidum.pdf
    • http://derma-dts.de/files/file/65199570393.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/5a0n8vqr8elckrovop0fs7h8tg/faparezefulureriwawo.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/20r3qpkg99quapeg2v0m6a1o47/lugixesujojovasir.pdf
    • http://www.deopendeur.org/imgUser/file/64769681174.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7bgrhn1pahq9pd6okf15asu2u1/32517981070.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=soundwire+server+para+android
    • 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_off0000bc45.bin
b4b75be0327acfb579415cdd564ffd4db5773daf8e57d74d7d21f1e156620f8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC45 10568 bytes
font_01_sfnt_off0000d484.bin
dab9634ed0a20370464aa0f294da158d1f96a557281ee29d8873cfec8dc0163e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD484 16836 bytes
font_02_sfnt_off0000fe2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 16792 bytes