Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb241f87a34bd507…

MALICIOUS

PDF

75.9 KB Created: 2021-06-25 21:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef7a9d20b0da5cefebcc0044277b0869 SHA-1: 36ac039b9acc040d3213a80892380606cbc739ab SHA-256: fb241f87a34bd5070c3f5f4a082a5ebd56e7b102b8644c514de44c68c194b70a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures to download further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/jvh0n7po9cke7ngu3kv87hnfsh/gilinetejurutusamulesig.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/bc288e2418e89704a680c75fe00e829c/vesez.pdf
    • http://alphaconsultinggroup.us/vpw/images/file/zowogowosemutogevopuso.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883fd7bcf24---96145682154.pdf
    • http://tulga.ru/editor/files/xixufimawexu.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/bijsliofdbo9eb9g99feo32r56/54777553872.pdf
    • http://nadiadsa.org/userfiles/file/zerunaxonapowa.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d0045d04---932865502.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985137404e3---76048111186.pdf
    • http://instant-image.net/UserFiles/Site/File/40731336486.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67569afcb---jenodotel.pdf
    • https://0900107678.com/upload/file/73571381451.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9f956a32e---jedugovemipuwa.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd702e419---xozaviwe.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/52874579377.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089f60456478---56201905202.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7he3rh73lqas65fn0sgsbtkbfr/56321717956.pdf
    • http://allasclub.com/campannas/file/xivifotasokabevakebij.pdf
    • http://1night2daytour.com/ckupload/files/10660396702.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+add+pdf+files+into+one
    • 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_off0000c7d0.bin
86d57645c6679060649b033180f41e563d12a4ad293bf90fddfadeb27efdec80
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 16516 bytes
font_01_sfnt_off0000f2e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 16792 bytes
font_02_sfnt_off00010afa.bin
e27a6c51b4559987774bd026b36165700cf00cce4e1754b65361a382cd077a43
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 10468 bytes