Malicious PDF — malware analysis report

Static analysis result for SHA-256 1277cc855e701133…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 22:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 542eb4c2d01dd707bddd9340f595a60d SHA-1: 574093a4dbb33b48d1c860b22b5c4abfb4be7313 SHA-256: 1277cc855e701133388f9964371d19ed72240b38d2115aaec9ffcd10519eef96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which host further PDF documents, suggesting a multi-stage download or phishing campaign. The presence of a 'download button' heuristic reinforces the lure aspect of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=real+followers+apk+download+new+version PDF link annotation
    • http://www.tsahimmongol.com/uploads/images/files/fajoninifob.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c56a13e5a---52999408410.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161405144ca5be---37134534008.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/26583117544.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/gesox.pdfIn PDF document text
    • http://ilkemymm.com/image/files/savaparomope.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/worakibarowarolekifinat.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/rixiwuxosexigibipagulita.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210913_184842.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/mesimofofojanodawi.pdfIn PDF document text
    • https://tch.lu/files/files/9556789404.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380c488d309---kiwakofanoku.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/53339085300.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/95076658917.pdfIn PDF document text
    • http://ellev.fr/upload/files/werew.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/nejobovopatabiputamixus.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210919152008_1256701355.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/miboki.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210906005724.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/715fd0259e3ddcb435655a6db04c0618/15487759665.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/45643946820.pdfIn PDF document text
    • http://canadanur.com/resimler/files/negupodatubin.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/fazufavamubodima.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/zexeremabolano.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/jepedofamajesutekalidota.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_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 19208 bytes
SHA-256: 28617f562d3b26ac9d8deace3b0dc5763ef4d4e67bb310b68d07e986731171ac
font_01_sfnt_off00011648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5F 10680 bytes
SHA-256: 2d281f12f0f41e7bddfa6f10752e2d4934cb9a214b18ba8ca53814cd83ddb5e7

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