Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edd753f12908fa4…

MALICIOUS

PDF

88.8 KB Created: 2021-09-09 19:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 54c6bb9ab99b71422656874728d0cfdf SHA-1: a1c606f083d5775569fc342e1241efded75b92fa SHA-256: 9edd753f12908fa4b7e96875241ffa72ef0ea24fea6b06edb27f4a8043d80e77
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://crewmak.ru/uplcv?utm_term=8+pool+long+line+apk+download PDF link annotation
    • http://www.corazondelsol.es/ckfinder/userfiles/files/81710121766.pdfIn PDF document text
    • http://air-ned.com/uploads/files/28098642377.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/19006883035.pdfIn PDF document text
    • http://halanmilk.com/upload/files/zoxobafebejuru.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/111862089.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/tibowavegerurudidara.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/wituge.pdfIn PDF document text
    • http://kasargod.net/uploads/file/lezub.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/diwarojuvivoxopoxo.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/53840535390.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135851e0b697---ponelavuzotamozonememuri.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/kavekonamagura.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/iuc1pskbnpp5igdmf9l8id3m5o/kawixukaxerovoreruvare.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/geduvabofejalogoj.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/fiwimuwipizotaxiwuf.pdfIn PDF document text
    • https://avflash.nl/upload/files/pinakaputukasek.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/xuvumufegukalukaji.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/77553182294.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/kobidup.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/filasode.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/11594562045.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/gosupevax.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/96587706917.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/43232243500.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0dd449e2660dab47635fd674215e605e/safewafetujovolawerutuxug.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_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 18316 bytes
SHA-256: 12a3299573d109a4085388499e73da64c646f4a4b6cd4bba6b26f60ffaf39623
font_01_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB1 10492 bytes
SHA-256: cd7823dd672ce7d1b0b9d8cb8003a29eff48d02603a9c0b743308c4e91e085c0

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