Malicious PDF — malware analysis report

Static analysis result for SHA-256 a517bbac194f2276…

MALICIOUS

PDF

73.7 KB Created: 2021-09-27 20:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b517174b37414da2eb0cb8e62117f0ce SHA-1: fff22bf114ce07995c385fc08b5dfc58e35ff494 SHA-256: a517bbac194f2276284c8365725817f1399ea71607fcd599cb699b20b626579c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised content management systems or disposable domains. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or malicious redirection schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://chcial.ru/uplcv?utm_term=hacking+tricks+for+android+mobile PDF link annotation
    • http://av72-reklama.ru/userfiles/file/163158352540477bc2adceef4d2c90.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/keviku.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/20553585001.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/abfada6de52936a46b802cf3aa81d0d1/zarividoxexa.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/13923556625.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/98897773416.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161325abe64ccb---nakimewewobuxuva.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/pasusozavit.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/21364882288.pdfIn PDF document text
    • http://deliver.cueicha.com/assets/upload/files/fejijasen.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/wonadodasunibume.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/73527730614.pdfIn PDF document text
    • http://elitvorota.ru/f/file/5937217555.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/xipepurozu.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/77966748544.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/tekesus.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/13870344743.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/nuvujadopipazoroniloz.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/ridarug.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc32abdbfe4549fbeac039ed04b2e16c/62161210771.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/46442410656.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/64464931867.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b093eca3e773bfc75f67de5d614e6128/80453064231.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_off0000b64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64A 11040 bytes
SHA-256: 34d7f4183742c3629558c81ea3c99515c697d9f264c37a1325d1d0f5a455ccdc
font_01_sfnt_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 18436 bytes
SHA-256: 7f9b3759bb29bd4a365bdb87acaf234158ae6af348fe5cddc850417c97b47a92

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