Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0e9c0e1011fadb…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 04:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67b1abc74f64c0aa2acb4a7e95e9b2f3 SHA-1: 6281c99110e41b3534d3d74084a7836e6b0dc0e0 SHA-256: cb0e9c0e1011fadb58198cd9f1b72c07a33ac72519ea65e74e993d210a115d72
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d511aa24b8---gopokesepamel.pdf
    • http://karate-talence.com/newsite/userfiles/files/77865442638.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819fd79ee9---39839715800.pdf
    • http://yanartekstil.com/firma/files/leduvamep.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/pesavemirudotupapazolu.pdf
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/85167930837.pdf
    • http://professional-tuner.at/uploaded/file/40560180428.pdf
    • http://kelsenator.com/userimages/gagudawomi.pdf
    • http://igigeothermal.jp/userfiles/file/dawupoj.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/26247861244.pdf
    • http://files.ibiza-ferien.de/file/73957473337.pdf
    • http://www.cpiequipos.com/assets/images/user_files/files/witut.pdf
    • http://dienlanhlongan.com/upload/files/wuzuzigovikuvu.pdf
    • http://grawerlik.pl/userfiles/file/solilonawuvoke.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a06b7d9a1---22822790629.pdf
    • https://mcsfood.com/images/file/fafujima.pdf
    • http://inannamsao.com/uploads/files/tezagawenirubit.pdf
    • https://seas2010.cienciaevida.pt/site/upload/file/fozovuxovis.pdf
    • https://danfort.lv/userfiles/file/53733869261.pdf
    • http://ccadl.com/files/20210902082740.pdf
    • http://kolaykanal.com/userfiles/files/feluta.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/66608447019.pdf
    • http://zhymwz.com/upfile/file/61930194185.pdf
    • https://pfollowers.com/ci/userfiles/files/48291819752.pdf
    • http://surveycook.com/upload/tmp/202109/file/96366307754.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=words+starting+with+l+and+ending+with+l
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d087.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 16792 bytes
font_01_sfnt_off0000e89e.bin
bcfed8e612facf13f793ecd64c9cb200357a5e5e44054cc1a9dba08c5129f271		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 10608 bytes
font_02_sfnt_off00010097.bin
a59fd3e19c619ae1281bfa76a8633397fa48b1d590dcddc0caf05c10e7bef6d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 18392 bytes

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