Malicious PDF — malware analysis report

Static analysis result for SHA-256 e779b3f5716597f6…

MALICIOUS

PDF

80.8 KB Created: 2021-07-07 08:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 163afd067bf13de6b0226402ef0b01f7 SHA-1: 1037faa03e292e8b5edfe21a48fb37e66c291a0a SHA-256: e779b3f5716597f6dc2a3d0a41d4cd9bb66caf04e7fb1de10bb5b6ddc6cec3b6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://szpk.hu/_user/file/14283177125.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/11583954345.pdf
    • https://imotrading.com/images/userfiles/vabefupagozorose.pdf
    • http://4bx.pl/public/file/34771009035.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160940211db1a5---96652776620.pdf
    • http://on-video.com/movies/movie_data/file/74644216572.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822cc620498---80188923407.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/252a77000d7b9f718b28b0dcdcd0e2a6/julilajub.pdf
    • http://moderncarrent.com/user_img/files/11771495600.pdf
    • http://wadirumshootingstars.com/userfiles/file///78892744902.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/kafikekowosajupasa.pdf
    • http://www.pzkexie.com/up_files/file/66703232003.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/40524554576.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c199557f9f6---2661028512.pdf
    • http://hpworld.hu/data/pic/Image/file/judapufewef.pdf
    • http://physiotherapy-warwickshire.com/user_file/file/84566389790.pdf
    • http://mextro.de/upload/files/gevefopotulezagakatuxu.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16073c4787a1f2---mikozivilaremijijopap.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/95771611a31ee1c5f4a0cfa27466d716/69801752428.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/b4dd2b8e6a91593c0e061b6d66d8151e/majupaduj.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/vilaselamiviga.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087560eea25c---sogenufigupetipigaxo.pdf
    • https://koncnc.com/genelresimler/file/14634571553.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0b736fce---tonelebatepolamer.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/12701312206.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c40ae3310b---numobegeli.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+convert+an+equation+from+standard+form+to+vertex+form
    • 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_off0000d4f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 16792 bytes
font_01_sfnt_off0000ed02.bin
974c42daecb153bf67ceaa5ba25eb880b14bdb0dd88a53fd4718cfe3139200b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 17752 bytes
font_02_sfnt_off00011b6a.bin
8dddfa69e72426ff0579e6f633d27bed8467b704f862d494ece70bded21cae9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 11084 bytes