Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2aecb551ff8de4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 08:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37c318c45b30be101d259d666b839dbc SHA-1: 54c1fbd9c192b68be0d2117afbf7772d0f480127 SHA-256: ef2aecb551ff8de40f70ca78b070672ac078d7590ac71ad9e1266a43dd1b1a4f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure suggests a lure to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://phulieumaymacbaoco.com/hinhanh_fckeditor/file/35727375921.pdf In PDF document text
    • https://petribax.com/userfiles/file/sarasuxebumil.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/89305060519.pdfIn PDF document text
    • http://tercovci.cz/files/file/89300334105.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/16000681472.pdfIn PDF document text
    • https://topupdana.com/contents/files/20615893300.pdfIn PDF document text
    • http://email-database.info/userfiles/file/85662703534.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/68761881748.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/figikavad.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/juwesoxob.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/6547424329.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/70471847089.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161391ced62b28---26904209535.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161389e35d0376---zawatikobubozojarojowiwir.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/1393907711.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/latisazidasipano.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sopanawijajiborigitepo.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/88315892411.pdfIn PDF document text
    • https://akvaguru.hu/user/file/28997244610.pdfIn PDF document text
    • http://rooptex.com/uploads/rowisuwa.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/3d0998db9f468d287a4aaaf05afe56c0/kumutufigop.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/birujibunun.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/21121062346.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/sawaligofivimuduzuvexano.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/perujidax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+download+android+apps+without+google+playPDF 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_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 10960 bytes
SHA-256: 44c64f3a5166dfadf00a618705eb1da2f5582c80d80ceeeceb718d9040ad59cf
font_02_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 16216 bytes
SHA-256: edf0caf36f16a526382d93f7301eb25f80996317728794570e89d58e4ef47b13

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