Malicious PDF — malware analysis report

Static analysis result for SHA-256 99861544cc70daca…

MALICIOUS

PDF

95.9 KB Created: 2021-07-31 17:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 646bf799112eeff8071c5f4d51683e31 SHA-1: 10a74f12caf4edb7694150ec09fb818265167ff6 SHA-256: 99861544cc70dacab8f299730b07df5a0c5ae0fd3dcd6cfa26aec58b1d24d2e6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of multiple unknown URLs further supports this, likely serving as lures for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf274ef7d2---robabej.pdf In PDF document text
    • http://mpti.ru/userfiles/file/sisatebeperakelilin.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de653a051d7---vuvediremem.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfcc80c75f---zurisu.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/27528281459.pdfIn PDF document text
    • https://combrooncom.com/contents//files/ruvozakiwovunagimuleta.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086b8c92d856---jajomeferi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082e9a98783f---38843252462.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/4rb5hfjn25sdv9k2rthd3bn5dk/josatiwutizozi.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d929a4b61---nubif.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qdgpac8d0vvks28qvbcmolpen2/24141090150.pdfIn PDF document text
    • https://agatanorek.com/files/file/24025369479.pdfIn PDF document text
    • http://rafaelokazakov.com/file/12305286012.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b6nfpsguc7f45tl5s1g8h1g44v/82131592231.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aabd6eab38---40416816434.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/fomizoxuvabero.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/61083270479.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/mirigumogamekowirasojoz.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/gugapudagavopadakulo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/enk7n3l0v42qo4ll8pfc4bsg8i/43348928169.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lragspopqrfca1ug120nro4nu7/ponabimuzimirefu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c7cc27ead17cfdfad3380463a251380a/kafupilelutasowaxufobufe.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/96140145218.pdfIn PDF document text
    • http://ibb-online.ru/f/file/pimeziwufefevatuxut.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/bajikanixipozuxativib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+turn+on+the+speakerphone+on+my+alcatelPDF 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_off00010d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 18992 bytes
SHA-256: 5d2cc996362b40d49a45ac85d1218102b27c95147b67e7e7ec84388c5a0c67e6
font_01_sfnt_off00013f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9E 11160 bytes
SHA-256: b5761803db3fc100c10732fae99c7e535fc1f118920f150815de635786ceca6d
font_02_sfnt_off00015996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1