Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81fc1207b623f9b…

MALICIOUS

PDF

90.2 KB Created: 2021-07-25 09:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b54d705d65abb18d479d9e977c091477 SHA-1: f336da5b96cbf511d41cfd92b60db77c28673810 SHA-256: b81fc1207b623f9b4710317a403772a88c784e3b8b8712f49262fee1d17420f0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links to external resources, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the nature of the heuristic firings indicate an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://martonaroniskola.net/userfiles/file/rakupogotivurexotim.pdf
    • http://bigxra.com/uploadfile/file/2021061516124073499.pdf
    • http://industriefotografie.ch/userfiles/files/39609594816.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/d3mmhdiek28pckknt2ejhi0jb9/88203219197.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/87072660800.pdf
    • https://beaszemin.com/files/lolorim.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cacb083e1cf---60496625133.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/faffe03c3d8b73db83a48f1763dfbbcf/92418977584.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160edfc7ad6023---93863835089.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/55e6d8494d69e36f3c98dd750cc2fad3/makomuzuponijeb.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4f4847b41dbeac384514e5f1df96d5dc/lozudugolomiditox.pdf
    • https://kingcarmotorista.net/uploads/files/25826811073.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5db5d6c7e9b699ab454307a49148ad18/9408114957.pdf
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/4f6a60c9abf94bd9fd45d8cc2af43e43/tolemuxewadakigizurokawa.pdf
    • http://pekingtogo.com/uploads/files/75648175695.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/37096275587.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f303c2c5b8---fewezizevuseje.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eeoq11ksnpvogtjg5r7qns0pl1/wevimejid.pdf
    • http://mientaytourist.com/uploads/files/49744209159.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c65ba4183---68033508178.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2317a21636---digameradoxevuve.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/09k2qbm97uh5ub8evejhs29og1/xebasufukenafof.pdf
    • http://ajisushionline.com/uploads/files/58427337891.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a71a2caa37f---45491620512.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083cc8a23ee7---91624168968.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160943d638c8e0---kopixirapibixabezavuket.pdf
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/37761298519.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+know+if+a+redox+reaction+is+acidic+or+basic
    • 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_off0000fa13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 16792 bytes
font_01_sfnt_off00011225.bin
aec84177163103fb1fbb707d661e2e06633ff77167c6ef604d6990b33c731374
pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 17552 bytes
font_02_sfnt_off000140d2.bin
d58a1932d996a89bf408b0332307bc88f01dff4b59625649666be8bca5b5d732
pdf-font-stream PDF embedded font (sfnt) at offset 0x140D2 10836 bytes