Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cb69628696dce8…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 00:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: fc737ee2cad219419da59500ee8dd5e3 SHA-1: e34d7b52bd7f200c78fc98672c44e8f23c1ca589 SHA-256: d5cb69628696dce8873b628e418ae110a300a1f3fe4a9a60199802e806d8ea80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9780

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://zoncmswebsitebeheer.nl/files/editor/file/93387544955.pdf In PDF document text
    • http://galerie45.com/userfiles/file/bubisabovikepideke.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210902092116.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/23773203846.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/towewesurejut.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/gutarume.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/gizewulogudo.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/25831500163.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/46596389576.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/zazirawibor.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/15065721884.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19428bec5---52354288974.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/bisitusevij.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/zokijaj.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/zojafesokazabepufadanar.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/simegivunured.pdfIn PDF document text
    • https://wsbtitan.com/images/file/36523562906.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dfb15299fca1b55e26f6d8ad714b255a/vibusenenis.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/tidemugokenujapebavi.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd3f862b9---fabufofujiliwu.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/wagutotukomipidus.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/4183091592.pdfIn PDF document text
    • https://eslms.com/userfiles/file/36135236870.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/jederi.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/51962951594.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/35411548298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=french+words+that+begin+with+kPDF 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
stream_004_off0000cf02.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCF02 18124 bytes
SHA-256: fa0a80d764bbc33d471ea9cae1bfa978ecb436af66e96ca322553129d00c0448
font_00_sfnt_off0000b606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB606 10900 bytes
SHA-256: 3086cf328e12307ef8de00578f68c8a8582f7156cdb34504085e66951d862a5f
font_02_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 15764 bytes
SHA-256: a96c47ce940825c984920bf759a9e99450ca94b1d2dd70f14bd9372e729eb433
font_03_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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