Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca1f30b0fd1f9dd…

MALICIOUS

PDF

87.6 KB Created: 2021-07-28 11:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3449ebdf554338788c533c8ec3db8913 SHA-1: a30ccdf50c7ea8554fa493190f634bcd33587ea1 SHA-256: 4ca1f30b0fd1f9ddc223f030ebcd3ac7f6f371d57bb6c2bb3d9333a6aee8bc95
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://xlpe.net/Images_upload/files/vusozunufawawewetudenuzuz.pdf In PDF document text
    • http://kjphotocon.org/data/userfiles/files/59995556658.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/zimun.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6009f3d7ca---muropupiremevemarir.pdfIn PDF document text
    • https://laser123.com/geektic/files/dajuzejifivomatuzadosobo.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/338a978559476734e1df9cf624484c24/28932077619.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed2069a934---23910334222.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/nofukevadipij.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6dce8299---2864248224.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210628113020.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/5babe17a2f00037649d34ed1da79c946/68963944506.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/428f288441643f5905115a58cfb0f33a/piwusap.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e0ab3c0d---fewiwifatediselefisiwo.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160eca127cef97---kowewagudijuni.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a13b73dc---34997475840.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/41990763317.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf525b3581---22114841789.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1549f384eae77f7739514b21a39d4f80/80218006913.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/giwadozalebojemuf.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/kesaduzalitokekalexev.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4241215e0b---86046853937.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/sutebu.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/davebotusogezikuvuze.pdfIn PDF document text
    • http://manleyboone.com/clients/3/3d/3dd19be848c73b0ce3a0430f7fd535f3/File/15828264625.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/3356514927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=walkthrough+harvest+moon+light+of+hope+indonesia+pdfPDF 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_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 16456 bytes
SHA-256: 1aaad31dcf7c7ef53ed8239dbe7545b869fcf142e153fbd0a1446c1626707765
font_01_sfnt_off00011e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3D 11196 bytes
SHA-256: 41438afd7178cbfe48c00e4a8e04c64f4665005358913fe9b17edc0afdd801b5
font_02_sfnt_off0001381d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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