Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cd4a04bb0b1f38…

MALICIOUS

PDF

86.3 KB Created: 2021-08-07 23:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73ae9534ec62544864851515a479e2ba SHA-1: 4b08249fc4606d6d82a8251a02f79c6de24b75c2 SHA-256: 35cd4a04bb0b1f3870a64acaac258f8e2ebddbe9ada7f65452ee01dffe26e37a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which appear to be part of a link farm hosted on compromised CMS uploads or disposable hosting. One high-severity heuristic specifically flags a PDF link to an algorithmically-generated URL, suggesting a malicious intent to redirect the user to a secondary payload. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://allegypttours.net/userfiles/files/suzevenaz.pdf In PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/kupevujipafik.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/32e91c0bc83c7c0acb5d065f36d2b114/taduginojigifewuzetupad.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3685c3812e---79579927257.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/6615615316.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/fejipelilizaguvenajew.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160748d4a53e9b---rarolawavunuresuxilu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/dcca5c4745b8f62a6eb8017b4bd15741/wiwudezufid.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/wusiso.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5a242578---1099291470.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/jamafular.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/g5ti6aor4q75g21gpv6gij7c01/risevifudabinironubi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea52a1e61e---kimavijel.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/9659713add800ef6b547008af561129b/sipudebemojidese.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/fonuwa.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/44cc0d9f54263a64faad8792813c40a8/42684553409.pdfIn PDF document text
    • http://airmon.hu/images/files/zugigin.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/59754245247.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/55c05394aab116a424e3475508a509c3/38660198444.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/ridutusufisusufera.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/jedituzabevapojivivav.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec99168515---5151289126.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1b53658c2839000d32b4b27331fea198/relonuj.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/8653361809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=spotify+apk+crack+redditPDF 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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B8 16876 bytes
SHA-256: 058cf85a79a0c26f9481ddc9dcf55454dffda9487c3e442f23fc43c25dd05a6d
font_02_sfnt_off00013296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13296 10576 bytes
SHA-256: ad2546f4cdc432d66ebab5380a4b6aea324a9d5a8f293c518c5cf28b0b270201

Open this report in the interactive analyzer, or submit your own file for analysis.