Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e77b3830239eb3…

MALICIOUS

PDF

72.2 KB Created: 2021-10-03 01:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7572ea7e576c7932eb4deee250b78cb4 SHA-1: 08b7fe569a24f2e0c78b7297801e33d48f5c22c6 SHA-256: d3e77b3830239eb39518056f452cc9f46b3d6ca39addde53d4b09ede6f601ff7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and links to compromised CMS uploads, indicating a likely intent to redirect users to malicious websites. While no scripts were explicitly extracted, the nature of the heuristics suggests potential for embedded malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://smidgel.ru/uplcv?utm_term=putting+too+much+effort+into+relationship+quotes PDF link annotation
    • http://dansungsala.com/uploads/files/sajopabesaguv.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/93010085151.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/dovufedivejidovetawuj.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/9962431938.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/45255210340.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/relapijogarijinokobuje.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/0be90fa596d9367cddb9ee6614178b9c/faworaxurevavegivuna.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/pijagudegoxupoxezasixa.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/92635912369.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/9386575536.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/xigibi.pdfIn PDF document text
    • https://purefeeling8.com/data/file/wubew.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152d39cbd262---58318207384.pdfIn PDF document text
    • http://colonia-hausmeister.de/uploads/files/44824872600.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/83a0e942f23a109d1e37e9f1a1dd64e1/80929576161.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/18497306907.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/juxirabatatuwuvakezu.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/xaruvolonodavit.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/zotidavisikefimese.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/jugixotuparemitoxiviro.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/9539479610.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/damexow.pdfIn PDF document text
    • http://vo23.ru/upload/file/40940728609.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8160e66cf---nazana.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///69933431601.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_off0000b301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB301 18032 bytes
SHA-256: b167fbbca0185261f9f9c24338cae2a215d8ad7a6011adec02c047195ae77687
font_01_sfnt_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 11176 bytes
SHA-256: c91772edf8f89303e486385b82e751257dc24f6cbba15ec493adecb0f2f06cda