Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e4c6fe2b84d562…

MALICIOUS

PDF

147.6 KB Created: 2021-08-25 12:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e007c25390e875cad65f434ea9f21535 SHA-1: 9506ef2ebfd1c6d391f64d0fabdcde024acc3ed4 SHA-256: e1e4c6fe2b84d5627ffcc03c49178df68c7fa61c9eb03f53e2920a02bce6b8a1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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://studiorinaldibedin.eu/userfiles/files/garemosotepaz.pdf
    • http://cappellastudio.it/userfiles/files/8439456426.pdf
    • http://status-go.net/gfx/userfiles/files/zesuvararut.pdf
    • http://nicolalazzarotto.com/userfiles/files/sojokadugagirogufuxixizu.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce46d33fa94---wililobini.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f263f0440---kegutuzizozakepamajop.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb508a0fd74---95067560866.pdf
    • http://creatinglifeoptions.com/userfiles/files/lofozataj.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/84376955738.pdf
    • http://marthomaiticherukole.com/userfiles/file/sofodubitaxobiv.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/346c26936dd1f20a18d3272f87ba8c4a/34200845660.pdf
    • http://www.iece.in/userfiles/file/verekujowumosevuk.pdf
    • http://bartuceviri.com/userfiles/file/lufezirupokag.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53101d0c52---91825917504.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856145e70a6---61084167663.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0beaabc959b71b5528d3a5d28c1802a/80115184626.pdf
    • https://osakadentalcare.com/contents//files/pedawamutotodumufejeka.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f643b10d1---ledifexavub.pdf
    • https://rzfmuhasebe.com/userfiles/file/11389415549.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/udl3g5tuvns5qqth2gduh2990r/64673148020.pdf
    • https://faresaldabbous.com/uploads/files/51984014382.pdf
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/69899492931.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/92365891640.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/bc005ae3969cfcf9adcb22311f7bed0a/loreropovotosipuwerawi.pdf
    • http://riverla.vn/uploads/userfiles/file/zexokafefarak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cells+reading+comprehension+worksheets+answer+key
    • 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_off0001db49.bin
fbc7cef7cb85e01cbf10a600c3c656a36ddcd3ab55097839f30b9dd68a990a05
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB49 11284 bytes
font_01_sfnt_off0001f572.bin
fd9677b0f0d3cda99bd5453f52ab5e440b25dcc2126e30468e765705a4c2169c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F572 19060 bytes
font_02_sfnt_off000227af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x227AF 16792 bytes