Malicious PDF — malware analysis report

Static analysis result for SHA-256 a682e3bda2088bad…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 03:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9132c63167c347c10f1a805280b56d91 SHA-1: 7ba7182070d8dc36d0c1e73df5a14b41c5dcbdce SHA-256: a682e3bda2088bad386554a20b141fe7f43d34ecdbdb964d97fb3dd5d111d922
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being a link farm hosted on compromised websites, likely serving as a lure to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

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 https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7420e81a---sokopofukorivoxixulun.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/t4d9qslnpu17c7fidgbludh267/40105223952.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/r77ge4oevdg5q9v7bo74bidaom/86088770665.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/gokeh415fdv8sl03f5aamshlpk/52440120844.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2d5d949ee28c9f3db3a9158795769eff/nematunawowukudewizesu.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/94672667985.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/37596904862.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/zazaku.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/kawineroru.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4dfa4e897af3a10b699dcb977f3fde7b/sozebisuxifatej.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/gukafulova.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a0cc37d3a96768aa7ee197a44d3aa6a4/jaremagozu.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f60340a301b---49549248010.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/65429742228.pdfIn PDF document text
    • http://fsanaq.com/upload/file/21081401174477400230cwbowzfifr.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/vodolofoxinutomu.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ev2e58h778h32mksrasl503k6d/porowesuzipopajopukofojez.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/xuvuponilowa.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/xanaroxolezadite.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210818_141912.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a5c70a22cf42345e74de011e56e652bd/23371098823.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/19290672524.pdfIn PDF document text
    • http://locke-3c.tw/uploads//files/202108100718461738.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/boxasirepobafikibunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=collecting+like+terms+worksheet+ks2PDF 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_off0000bc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC95 17880 bytes
SHA-256: b46d6d33a7411e25cf65b44c3dd7b96cbaf388f83973f87fd6bc01e764818b00
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 10844 bytes
SHA-256: f0b48964c3e4cc33214891e66ae550268f32482ced31780522e1f8fb71bdfafd