Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fe2540af178516…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 11:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 593d443d650e4b760568096bf8fe6a8b SHA-1: f10e81105b01e3bc1d1c0d51c2da093ecebf9d6d SHA-256: 68fe2540af1785169811aa15bfbb334478e3897a58c1147badf73bc1a65c8d0a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including the presence of algorithmically generated URLs and links to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic 'SE_DOWNLOAD_BUTTON' indicates a deceptive call-to-action, further supporting a malicious intent to trick users into downloading further content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://abwmechanicsville.com/uploads/files/ligiwoxokesotivalalo.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/hffn9amce4oovmhtq00nejqsen/73227317228.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4ca50fd8---tasedik.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/putidefafazowidi.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/manoxiz.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160875df5eefb3---baxazakisarurabinen.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/10426064137.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/54326034654.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/xetenewefasewujebixigexu.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/56146392943.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/20872940950.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/4386379703.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/27888923134.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/69304784309.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/fenebitunowilemedowesazub.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcf02a6f3b---96653834919.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7ee35380c7757b328e5aa7ce4aceb5d1/43682031710.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/83003123924.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/672f0f95d9ddbd6cd796048098ff0b04/7213803438.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/nubib.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0b69b7fef52e145d41b212e2cef749e6/saxigiburoj.pdfIn PDF document text
    • http://fwullong.com/upfiles/editor/files/76825654413.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23b03f0cb2---12230138211.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085df708c687---bimuto.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b37833bf6---lerebulujowawapubusogume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+apply+border+in+wordPDF 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_off0000e5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A3 16940 bytes
SHA-256: 78caf7cf4c757832c76ef71daba43ff279c9cdc453f5e0d9701a6686039851c6
font_01_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001297c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 10548 bytes
SHA-256: 2bc258e54b0121ab5610dad79237989e93d1df15d99b04828b96328c231722fe