Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a8c4bd924d560b…

MALICIOUS

PDF

106.6 KB Created: 2021-06-27 15:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 092d14d2047bc0ea6a48028b1ca7c9b9 SHA-1: 62afdb05144cb1c8975728e11aa4d4388b611341 SHA-256: f3a8c4bd924d560b657c9010206bfef2d66740f1a7df65501e08be19e6fd4545
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://philabc.ru/uplcv?utm_term=just+the+icing+on+the+cake+idiom
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3087e1e6f7---xugimamanusixudozemuzafut.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/6ad81fe4c758da033958a2491b17d516/vejelubapopomimaki.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608596e4a084b---60341778461.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/a6f96af2016b0eddd92106c46314915c/zakiki.pdf
    • http://beveragesgs.com/userfiles/file/29883774314.pdf
    • http://jdhs77.com/clients/58520/File/54485272553.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a099cd7b9d8---11996879158.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/9461de7a817e7b6ee0daacf33b8a9238/85512602874.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e796f4a7f9---86605649317.pdf
    • http://laweasy.kr/userfiles/file/82869819437.pdf
    • http://leebyunghun.org/new/upload/board/files/2368442363.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/bk09g2saa54ndns7mkqkq8hfoi/41791489105.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7dc12a12a6b6fca45b1d12974b2d5d8/magutato.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2e4a5239---79315377081.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/uuu8vp0l5mhm3k7gg79qsr61cj/napegarenesil.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06bb9df24---repazevunabebewog.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e4d1597f8---refexenaxoxi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69cb1b967---dobifavafesuvovamekabirip.pdf
    • https://burstallconrad.com/editor_files/file/57166992043.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a933898cd289abee9ec62846c44c90c7/nudawekufubusijezipiju.pdf
    • http://armanetti.com/images/3386937782.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014b9f.bin
8f26ff678857ac4a7fd195380685cc88d94f4336d1c91c6c9625b83fb05ec77b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14B9F 19628 bytes
font_00_sfnt_off00011871.bin
d9793dffae66102db2b9b4c32d559094f688da3204dc7778661e0fe402afa303
pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 19412 bytes
font_02_sfnt_off00016c0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16C0A 16792 bytes
font_03_sfnt_off00018421.bin
52283971e626110c61bfa152247e3680a4ad6056c3e1f8d04c4d22f474289305
pdf-font-stream PDF embedded font (sfnt) at offset 0x18421 10852 bytes