Malicious PDF — malware analysis report

Static analysis result for SHA-256 10945e9ce1c12634…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 02:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67ff65cfd8292b1f15e6a0f045ec1217 SHA-1: bdd6d31bdc99d2d9396f16d28937d10db0a54642 SHA-256: 10945e9ce1c126341e007c872de4bd89a16836a91c7e65efdb71b26d2a7663b3
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters in the URLs points towards a coordinated effort to redirect users to potentially harmful content.

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 https://infrive.ru/uplcv?utm_term=spider+man+3+ppsspp PDF link annotation
    • https://zilalcooling.com/other_files/File/redavebexevaxefebinewovas.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52af84c6a0fec68c1bcbead8215c62f8/xusobexuziwa.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/68903035113.pdfIn PDF document text
    • http://mosjob.ru/images/file/fazaxixadulev.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/kolefirisenisafa.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/rowunabidubinularo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a721703bc8---vopepukesulafofuvatagiwut.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/zibakofeba.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/wuwizovususaloresefelur.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210905_121640.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3d94eda292c2e5cfc94c7d0980e5d098/zifabi.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/zamiwawetojokixisewigu.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/roweber.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/fuwavoxulotawapijime.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/belesimajavur.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/naxagejugubikokikizewip.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/rakotomuwuloxadutiruru.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/25507493917.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/54333358585.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/19913292883.pdfIn PDF document text
    • http://apcmagon.com/userfiles/bijibemavufagomimiwixosew.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/85283097739.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/54111117789.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/47342991034.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_off0000cc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC51 10536 bytes
SHA-256: 579e86f9be485295aaf2f187859e3356f58eb2ae86656217c66dbd3a4cf5f4f0
font_01_sfnt_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 18780 bytes
SHA-256: 00b5d635ef49ee1d996de920e14bea40f9ac6d5ad2f52baffd71c4acd31024df
font_02_sfnt_off00011531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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