Malicious PDF — malware analysis report

Static analysis result for SHA-256 1575ecaa3ba070ae…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 16:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 711bfcfbb1d48929ffe7c796b977b95b SHA-1: 29da98f9f9d891841b2b6dbe48ec1166adbf315c SHA-256: 1575ecaa3ba070ae4c06e3c3de62771745081e862eeff383a40cfec698e9c434
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised websites. The presence of numerous external URIs, including those hosted on compromised CMS uploads and disposable domains, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=1994+harold+camping+pdf PDF link annotation
    • http://gabinetortodontyczny.eu/userfiles/file/39426221463.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/78313174721.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/9474349959.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/vasawidibugedimavatodowa.pdfIn PDF document text
    • https://ratosatu.com/contents/files/virapaxasaru.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/59003632342.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/54119016402.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/rejadakusenepe.pdfIn PDF document text
    • http://falconltd.pl/cache/file/52034536946.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/pofubewuzu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/jtj8tjp4tujaq3vbh5edl38okq/10362640823.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc9d35e32---togunusomijate.pdfIn PDF document text
    • https://kham.vn/userfiles/file/dibanowexafopipisi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4dfaa4f4---tizefujid.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/xofimisatodoran.pdfIn PDF document text
    • http://shophouse.info/images/files/82238353158.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba10ad686---golokafebatajofow.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/xofibebalatabokeriko.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/f4eqc9k3s718s5psrs8hkj6b14/gorepanu.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/16772323988.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/66583778412.pdfIn PDF document text
    • http://rinsacars.com/files/others/zilizadezobew.pdfIn PDF document text
    • http://rts-3.ru/upload/files/tiwutop.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/83872537573.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_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 18400 bytes
SHA-256: 8e0371bc8dfe8ec8e185fdbe4bf0f8945222eab9c3dce8a61b47ed82881e474f
font_02_sfnt_off0001263e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263E 10872 bytes
SHA-256: 1bc0b22d175f4405709a5c5c4128b04ec43ed5133a062c5cf6052cf937be092f

Open this report in the interactive analyzer, or submit your own file for analysis.