Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadb5cbae931c8d4…

MALICIOUS

PDF

88.0 KB Created: 2021-07-20 21:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9bc1e8af286f02396219dd0e30add991 SHA-1: 7eb5524c77dc324406a9dab8659819537e74290c SHA-256: fadb5cbae931c8d48831d1b284dfe714d7083213065cae90cbd6f939194ff395
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on domains associated with compromised CMS uploads or disposable hosting. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62fa829310---60728880810.pdf In PDF document text
    • http://abwferrellpkwy.com/uploads/files/34732129794.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/xabonevalolesinilox.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c111af16aa---punuzaxirakukekif.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/m1c1e5unhrdje95i86hio808j9/53551608714.pdfIn PDF document text
    • http://ha-sine.com/d/files/62568021903.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/92008428130.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/37196510239.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fe3a1f459---33619475283.pdfIn PDF document text
    • https://efnnma.org/files/file/22819808996.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ksbj69negpeqknfd8tsk5kuvof/8255891978.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/db2be064a6eae78fb1e32cfe6d9b4345/xajefexori.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6faf727bee---73849569772.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/bibonum.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/45b9e6f012a6fbe1bbf1d28cda3e0c81/gagetorozamunewunipada.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/79822672033.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/17814227675.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b66602fa---kujazolomibetir.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/5706d4cdff420796bcc1442e4daba3fc/12601061434.pdfIn PDF document text
    • https://bloomeng.com/uploads/28958925898.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/todobiboponadopokukeroko.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/oc92h0n9s3f4t9mmhrnjd5oknf/rabipefafazane.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/k277jk45n7cd77llklms2rtu8a/42223586684.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f642c28f0---bosopubolatufekuzupezoguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=roasted+string+beansPDF 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_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 10564 bytes
SHA-256: 4a7e855e65648acbfcb28d20f3b071be8d0247bc58a0d957e069cef72d7da00a
font_01_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 17648 bytes
SHA-256: defdcac47235d9e14c16e1e9e336528f061acd9936260a9a9fdaed90eefa1c23
font_02_sfnt_off00013b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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