Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85a6a9300b80d0e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 02:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f799ccd58f7c36c0889ddd1c75feaf55 SHA-1: a349c077c297dd7bbc58853561f4fcbcf13cbb25 SHA-256: c85a6a9300b80d0ea519678ea41e5588a0bfb1e4c76d219c0ad64e894205c6aa
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting. These links are likely intended to redirect the user to a malicious download or phishing page, as indicated by the 'link farm' heuristic and the ClamAV detection. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=rebel+racing+hack+mod+apk PDF link annotation
    • http://makeyourpartnermelt.com/userfiles/file/44208297780.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/44234662548.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d845855fb725ff47bc7e7ba52307abe1/sopixikuru.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/bajomuku.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/36592035587.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/bowelonisogon.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0c2721d3e80321686c72ce66276be63d/18932717933.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b2eba395---88494304938.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210906_2616E8F20A44A134.pdfIn PDF document text
    • http://contelex.it/userfiles/files/76072372820.pdfIn PDF document text
    • https://mattress-leader.com/media/91915872275.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/wigeged.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/samepevirogogamipotusita.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/88901153940.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/80175317035.pdfIn PDF document text
    • http://coachhouse.info/assets/file/31036216559.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/62039780793.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/botojimuzere.pdfIn PDF document text
    • https://dacola.com/upload/files/87496067503.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/77400928810.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/3421229166.pdfIn PDF document text
    • http://xn--12cnpa1crj9cff4b4eybemi0af5u5i.com/ckfinder/images/files/97819127812.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/xowuxigovurupipitipivibi.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_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 10972 bytes
SHA-256: 30094e5d9f7d73eb6abe98f94abbb8745f2c66034d77f5aea32e1b81e49a6a67
font_01_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 18144 bytes
SHA-256: 0ea4f51e9eb1ad6a2b50b89e0c124d43d0f4166d0a39eae0f5e7be1955f223a0
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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