Malicious PDF — malware analysis report

Static analysis result for SHA-256 78252f55d999d3d1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-15 23:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 940a7d560bb062609ea2f56f7b05b5f3 SHA-1: aa559beea4def757b96f2e2d0123e35d01130fa6 SHA-256: 78252f55d999d3d1883cf48c6930327110168aaed1fd28e5c5dc1bfe1bac3b01
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and multiple external links, including those hosted on compromised CMS uploads and disposable domains, suggests an attempt to redirect users to malicious content or download further payloads. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick users into initiating a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=ml+mod+apk+download+2021 PDF link annotation
    • https://karapinler.com/calisma2/files/uploads/4353699046.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/duxujise.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/67508060661.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130db3a65193---xuzelufejatuka.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/sagesumo.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/durudatovatibotaxaga.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/dunarizotuwok.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/6238382318.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/58879981284.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/41054765769.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kaniloluvunodowusamur.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/dexopi.pdfIn PDF document text
    • https://websbag.com/uploads/files/doxoz.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/lufim.pdfIn PDF document text
    • http://360global.ca/userfiles/file/90290780402.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/6smjphdthhkgfeu285me4f7am7/wafizopokugowotog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e09cd8b5c0---lotufivibugozipuza.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/govaridulosoxul.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/nedejawuwuvuzitutulozesa.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/vutitufesuwujemizimupov.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/ganewekawexedugikaz.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613129c9bc5f4---77153024731.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/59667274816.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/bunitubatowuzubageveb.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_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 10428 bytes
SHA-256: a26add2f29ebe08eb306cb53e01bdc7981d76fb772d0feae58f1ebb920768ba2
font_01_sfnt_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 18044 bytes
SHA-256: f850f12d95f30ab6abb9a04aa2eaeaad0b07dce7be03d9f83f2ca87f8602fbdd

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