Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1ba802b44b6318…

MALICIOUS

PDF

89.9 KB Created: 2021-06-27 05:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c0a48a1cc6ccfe71068fbc28357058f SHA-1: 264d59590c31f9a7a3fc6492079c94b53b01a3e7 SHA-256: 1a1ba802b44b63184ea92eb5f2a570b7fdfdb456a1e7ea3131859ff37dece635
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to exploit users through deceptive links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/lejibekewati.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/f963a2f62bf220320b4045ceb91c3de5/70097666871.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba46269f2cec1f39c445257d922254a7/39330405749.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160924b0e2509e---wuvaluv.pdf
    • http://qytbearing.com/upfile/file/sakavesitivuputejex.pdf
    • http://acecaalcoy.com/userfiles/file/95801841988.pdf
    • https://n-v-v.dk/userfiles/file/29828774105.pdf
    • http://color-gateway.com/userfiles/file/digomo.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/sinekenoro.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739243cefcb---loluzafuxem.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/89074336194.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/1khkml42l5hpir7frgvaah7eff/rusopovuvofo.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4c39a44f6473d3a384798559b6e5441e/wodifelogewopozokozivo.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/845e6439c533819b6a2cd883588425eb/91009029627.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a286e3a482f---xinapufewowimem.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2ddc59cc---fawesigigevelejapepex.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f98193b85---bexorizijamijoxixekulux.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2e309cb204052dd70b11b7bd8ebf7bf1/80761558751.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160871450ba05a---63843200247.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084b64eba1c9---13741896643.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79aaac076c---donugi.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ccd88ea3cfe4da248d30e8cad97e9804/38566003316.pdf
    • http://mywayrtk.info/userfiles/file/lefuvinotitekulomotakon.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb58ee701e---folakenusirofanimakibak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+long+is+frozen+ground+turkey+good+in+the+freezer
    • 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_off0000fc53.bin
968c69f96e744e185d2ca941edc73a3cc5c061424cc859961a61accdad165c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 17068 bytes
font_01_sfnt_off000128cf.bin
3363efe13d44704cb7ccaee00e2d4fc886f0b927546d9c9496fdb19a9f786272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128CF 10916 bytes
font_02_sfnt_off000141e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141E4 16792 bytes

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