Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d85c802f4d1738…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 16:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ece9664494b19ac71c4af05a8d5b5760 SHA-1: c1886843df9d916cdc6a9af5c102b8c94be30bbb SHA-256: 67d85c802f4d17382d124a44976be2d7b2dd4191d3076785c30832df51eb9c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the PDF structure strongly suggest it is used as a lure in a phishing campaign, likely to redirect users to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93e6960f5e---50327424162.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/h54prg2p4b9p28l9kakktss6a0/71793437346.pdf
    • https://tjpapigroup3.com/contents//files/58780033113.pdf
    • http://ampletrekking.com/userfiles/file/wupomoxobosepoxezob.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8de7158fb---49356227694.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/b06b8a1f9b572967f9d911f81528eb56/tusafotolejijalumoderoxe.pdf
    • http://teamhead.net/userfiles/file/90491945913.pdf
    • https://hmanagement.net/userfiles/file/kuzevaxometelazurufu.pdf
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/penoxepopinebukawopunow.pdf
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/pfq6s72olu27glr9ghdr007qlk/sefulurubiwawa.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20ab81644---dozaxedawizi.pdf
    • http://www.examnotice.in/uploads/files/danuvozoxifipixulap.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b89b6712e---pebubizefit.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/xevijexefuzi.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/46690984592.pdf
    • https://laplacedesstores.com/upload/file/91122404985.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a2260980f---95791236332.pdf
    • http://rebizplus.com/userfiles/file/mefomakinag.pdf
    • https://accuratesearch.com/userfiles/file/jabimawifegufileb.pdf
    • http://beerskiboot.de/img/upload/file/9143289437.pdf
    • http://animalscipublisher.com/files/upfiles/file/3304842912.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/08a03f59ef5b932aeca10d5076ea6aa2/89706027009.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/06o2cm7bo2u2lauvc6pnv8lll1/lewupiluzakipilafunos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=speak+up+4th+edition+pdf+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 16792 bytes
font_01_sfnt_off0000fbff.bin
f29224a6b058eb6ddb16f17d99d64561dc1318222432fb37c140c23a9472e9d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 18684 bytes
font_02_sfnt_off00012c38.bin
01f665042bce7b7a38683390deed982b4630ee943eab969f97f76fa870944695
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C38 10724 bytes