Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2fb8aec89b8981…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 07:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da7e4b190d645156c0ed1d75ea1cd35a SHA-1: b800bd61cbcaa777680846a03f07d8c874b78c5a SHA-256: fd2fb8aec89b8981dc5923cd5550f1911283857aa395a33a80ebed3baefde11f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to other PDF files hosted on potentially compromised websites or disposable domains, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nomylo.ru/uplcv?utm_term=virtual+dj+free+apk PDF link annotation
    • http://biosystech.com/pdsFck/file/rizapibiputisopif.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/75016163829.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/aa3ab33e60fff10e10a2614888053f87/67835177160.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/lewavabogavi.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/74605707451.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/jezipikokodefekawivolukow.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/burisexovin.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/10232231478.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/wewanifoxidun.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/43782638091.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/5095479051.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/wixelave.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/56055215744.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/47266640684.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210918101458719.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109130257176153.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f5a0a1ed13bf39ba1f99e2d8e7218fa/38555801585.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/37854140618.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210904_120402.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210902203154_820998256.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/67844183784.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/76990636643.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8e00e882e---gubebenitifekojevatek.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_off0000d19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19C 17964 bytes
SHA-256: 8c8c75b71665d7a41cf10be77d2d1309b923ef99d4c58fee4c7ced79e68f5cda
font_01_sfnt_off0001004e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 10388 bytes
SHA-256: cb37ef6ff8996a10e568615623e20134e1c5953c5d8c195746d5698846ca73c6

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