Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99a52f6a144595f…

MALICIOUS

PDF

92.1 KB Created: 2021-07-01 22:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 875c5d61ad30eb4857752a91bff9e627 SHA-1: c486f50f30ff2119a0d2677ebd0bee841f57593b SHA-256: f99a52f6a144595f2cf130047067d7c1702fa55f19253a20376dc74ef2e9251a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and 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 0.9941

Heuristics 6

  • 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 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://www.malagatour.es/ckfinder/userfiles/files/45922245088.pdf In PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/volixoziweves.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fae8490165092d8453c9f73441d766d5/gudopobebij.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7bae7958b---13587294007.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6501e2072e---votodujisaseginonikibikat.pdfIn PDF document text
    • https://laser123.com/geektic/files/guzawidokevopo.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2190f421b---25618778045.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/tijifitekemetol.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/74459206522.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a170588620c---29467016699.pdfIn PDF document text
    • http://armanetti.com/images/vatelus.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a3400540---bunuzizufexarotefetatikin.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/67755306784.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3c3e62ee---sifimutixotiwadoxaz.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/v4nbp28l80r4h01fe392d71c6s/1874978912.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/4b0493aadb20091045e8b0590e24c39a/bupapuvelanuvaz.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9448be3782b1b69d3613539faf42c824/puduwewakadogapemanusa.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/e42bb626785e64afb471065bfc00a447/gupegozevewep.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ea4393a6ed074d198ba33280a479714d/sagol.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2ad2b45c---5736882056.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/97321618754.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31dac56c5---90419756024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=arms+and+the+man+questions+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 17424 bytes
SHA-256: af7f0a86e6add6c5f0b5d51f06fd8e9cf4644d50de8ba4dd75ee343ae8691116
font_02_sfnt_off00013345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13345 10780 bytes
SHA-256: dd57cfa5c760fb0c0f5f6912554226acdbe137e3b589c41a61134d1460e26cb9
font_03_sfnt_off00014bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBB 16528 bytes
SHA-256: ebe5d267b7b1681026549d352e08beb78dca46423177e671e4977316cd80b593

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