Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca77a17deb639f4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 01:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2febe70e837dd8493e26f231bb71e6b0 SHA-1: 416f9f29ab8bfdc7d41ef1205a2df7b6778fe9a4 SHA-256: fca77a17deb639f4ade0a9d0a0bc830eabff75d136c7bdd93209eca7370fdb8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://orthocarecentroortopedico.it/userfiles/files/34646241960.pdf In PDF document text
    • http://prosefkuchare.cz/userfiles/zodedejepugaraduge.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/28335892361.pdfIn PDF document text
    • http://zerosquareonline.com/file/gipozezakojujojaxapo.pdfIn PDF document text
    • https://protrialse.eu/files/files/fudini.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142ca1d1196d---dogumevisofatorewikobap.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/80261935608.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/13750003019.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/guxipiwiwapewizuvokitugo.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/36653881867.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/sonowebewukopon.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/buvenime.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/zemekuzeso.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/96872130877.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/felaguzemedo.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/33229660929.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/83321949132.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/temak.pdfIn PDF document text
    • https://pmms-online.com/assets/file/jojaw.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/1a2v8m4052tvf0b204non02rlb/kemevikabipe.pdfIn PDF document text
    • http://coffee33.ru/archive/file/92223069339.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/69090688806.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996b8c3210---vupobafodez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sandeep+garg+microeconomics+class+11+pdf+free+downloadPDF 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_off0000d4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CB 11076 bytes
SHA-256: 8d6974b188bd5ea5605c8eb644c0c52da3dc4a3a6e3de7943b2610d8e60b3d30
font_01_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 17616 bytes
SHA-256: 9cd5923b65f41582ec1dec21b78aaf4fc1887586cd3dc2eb13ebdca8dc71fc8f