Malicious PDF — malware analysis report

Static analysis result for SHA-256 788aa4de48b5b7af…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 09:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2cfc25e22f58e529aa2512fc7456324b SHA-1: 54fb6e2dd05e4b2fff26a70f6c08a2fac6dc71a3 SHA-256: 788aa4de48b5b7afc366431708a9877e4de1d96b3e7b09f1d13ebd56e646760c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many hosted on compromised WordPress sites, which likely serve as a link farm to direct users to malicious content or downloads. The presence of external URIs and the 'link farm' heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=how+to+launch+apk+on+ios PDF link annotation
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161343f63ce81b---33692336134.pdfIn PDF document text
    • http://erdbau-rauch.at/9830777139.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/67445656493.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/36175395750.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/ximabe.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/87862495345.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/41426948446.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/topen.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/likukulekol.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210911013658.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/fopezapanuso.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/zebak.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/rujugagados.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/46304207845.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/79rq91gfe749krsatm5b5e5q02/76818199374.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109050835504593.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/povakudepo.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/16642477467.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/63150772231.pdfIn PDF document text
    • http://all-premium.com/user_file/files/fewuwimemalesij.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb59a60a9---kegul.pdfIn PDF document text
    • http://tion.hu/upload/file/xebikumujaxuzad.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_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 18000 bytes
SHA-256: f9bb9561418594289c235cc24218b9019a0fcb92654540d0505ed85a39598138
font_02_sfnt_off00011f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 10508 bytes
SHA-256: 8287c3f45ae32e552d97aa3e8c74a11f2d36206240beab2ddee6f874c281b813