Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0c59cb7a11adc7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 20:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 10991dbcaf4142f1cd775906ca3da0ad SHA-1: e1726606e9a1e85cac60d4b65aae4734e2b93597 SHA-256: aa0c59cb7a11adc7cb5de0875e3d50de709d0028fb34b22e93a847b7a5c1565f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous external URIs, including one with a 'utm_term' parameter, further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://coretry.ru/uplcv?utm_term=a+quiet+place+2+cillian+murphy PDF link annotation
    • http://bycongroup.com/UserFiles/file/83131590045.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/nukugimupowugejefajarix.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/79272072921.pdfIn PDF document text
    • http://juentai.com/userfiles/files/99138260901.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/67598394691.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/2967471851.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/mafiwiverekutasapis.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408f4d7eb26---dikilunemodololud.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/25485745373.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e12689687---xuligusuxuxumulanomipu.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/vadowipobefetana.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00fbef1f2---dokudelapojega.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/tedidovokisasasepoxetipab.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/7352311398.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/zadajesomijovolobu.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/tezijijadifegutaferewavu.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/99261102947.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/voner.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161465db2740d3---35677176729.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/fanosamisivekeba.pdfIn PDF document text
    • http://tabletopad.com/images/file/zuxuledetolemasaj.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/99297570192.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16146cbedce2ce---padetarikemos.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/95200019639.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/15568137592.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_off0000b15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 15280 bytes
SHA-256: 67efbe29e660c77332401cc6485d9aca4f81bd71d120e536827a5976fce1c1b8
font_01_sfnt_off0000d844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD844 10812 bytes
SHA-256: 7adb206d8245f7dafee8e23d1f70aa89e565849ad049dea2998c3a0fcef01bd1
font_02_sfnt_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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