Malicious PDF — malware analysis report

Static analysis result for SHA-256 d751bc52516bf953…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 13:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 021af14835b7fc04cc8ca679ed86649d SHA-1: 6718152aa249a77efa75996653c660c5bb89ef45 SHA-256: d751bc52516bf953d00a4e903550372a98cf90d669716b22d9cf766f060f170c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'pokemon+diamond+download+gba' UTM term in one URL indicates a lure to trick users into clicking malicious links. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://crewmak.ru/uplcv?utm_term=pokemon+diamond+download+gba PDF link annotation
    • https://kham.vn/userfiles/file/jeterapifogeferusetijufu.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/38283129719.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/30034538726.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/45766279065.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/pituwominuviwepa.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/89975055465.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/84189365614.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/puratuwinaxubufipifegano.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/5i2akau9ika4rpp07qbn2s1ven/dawaze.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/93567870020.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/5345562273.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/53474629552.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/53855358278.pdfIn PDF document text
    • https://spyboarcams.com/files/muvux.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1omjd7ba90uo5hvbircofgh5co/57979281546.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/98805603884.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/51687240573.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615117753d782---fibopetededusudevabe.pdfIn PDF document text
    • http://lblussana.it/images/file/62085198678.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/20616214116.pdfIn PDF document text
    • https://mkontroll.hu/File/wewapukajutuxujukiv.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-6/20210906022007682953.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/6482865861.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/zexifexenobususu.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/renepazi.pdfIn PDF document text
    • 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_off0000b0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC913 10544 bytes
SHA-256: e9f49f9ce48f9b3c570f1ce65a44798b0376ee4a88833bb93f767feede90b333
font_02_sfnt_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 15072 bytes
SHA-256: df6d95d1ac485e335acb431b2c6ecefd29f1eee6731a7083a4dd534164804daf