Malicious PDF — malware analysis report

Static analysis result for SHA-256 165378cb759c3155…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 07:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 212c50579886a30f81627267294fa658 SHA-1: 26b30efdbc3987f441889ae2609cb09012e29a51 SHA-256: 165378cb759c31554dbc020f28a1e0d442ad900963ccd026f00c60804f692e89
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://thegioioto.store/upload/files/panufojikusixafifewupaj.pdf In PDF document text
    • http://greensketch.in/userfiles/file/1805797296.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/silepejedepadifirel.pdfIn PDF document text
    • http://www.bash.cl/media/file/95882496461.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/fivosurigijuv.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/32730556189.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba5717517---noziravedelobodamebix.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/godemiwaz.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/99799626672.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/84935805683.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/85414896585.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/laberavesatove.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/21020677953.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/pivomonarelekumu.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/83898163757.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/vijajulubufitofamaj.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/somufug.pdfIn PDF document text
    • http://hongdacable.com/d/files/beviriz.pdfIn PDF document text
    • http://honghuibio.com/d/files/fuzidimasutovugazumena.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d85e32d3dafe80f8239f57e1bce0f5e5/tumavixixusesizut.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/wuvunexakuledaz.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/50254874537.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e65626a1ee5dde0585e8fde3084f5e01/56460175386.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/zojuzivuvobopasamolozilij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=zack+snyder+justice+league+english+subtitlesPDF 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_off0000c5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BC 17820 bytes
SHA-256: 1944986a395cdf9356b7c95fdfe249c0245619c1fa1e3044893403531f7b5d4b
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 11068 bytes
SHA-256: 0c7c40408578e6978394ceab798eeffab2f12f3b471966f6ec979c40c9a40386
font_02_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1