Malicious PDF — malware analysis report

Static analysis result for SHA-256 4168eb447309e183…

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 02:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 29634f007ab585132414032dbcff6b07 SHA-1: 82605fd1e7c5490b70a5464611b4ec5ea9a8e04b SHA-256: 4168eb447309e1839f4c3e485fd1371f240109baf02fd6e2088c0c1f237311bc
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics points towards a tactic of directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://davcpundri.com/css/file/dakobetivinu.pdf In PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/r5pffpapj2v5a397m30810uvt0/8445795164.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/bf9e2579974829810ddac5467008f59e/zavatezuvas.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/jejedixup.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/18398565877.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/rogebivemor.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/87752860942.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/dinerefeginuruzufo.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/vupibijevaj.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/pf01cvelfkm57tln65cbrmtf18/33273996068.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/14262932815.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b15bd993b---96472808983.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf4e50f759---pujugarusagagobulinav.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/33950440484.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25e46c3ed2---59037987356.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cbfm907ojtm9na018jp3u51oe9/72875975592.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/97359815614.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7ef9698c---96716573003.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/hol33rvrb7sbovq2l3bmtdjr13/88314021204.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/xenusipot.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3bcc7cf66ae9f196337007306df313df/walazivi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d279930382---fuderupedupawefip.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1bc845e8d---99710309020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=a+byte+is+equivalent+toPDF link annotation
    • 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_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 17508 bytes
SHA-256: 6d9da3bd90bdf0b3b64791689afb0b051f492dd92991d2b11a017c17a845e1a9
font_01_sfnt_off00012872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12872 10548 bytes
SHA-256: a2bcd58c14a2805079f3c8121f3051c7814a152bce21627071432512308d25eb
font_02_sfnt_off000140b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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