Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d34b24d05e55d2…

MALICIOUS

PDF

84.4 KB Created: 2021-09-07 23:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3d5b36b9dfcd084c9b9fc069d1fc2fe SHA-1: c86877cea2e11384ce3852fd257eccb75eeda983 SHA-256: 22d34b24d05e55d22a29b4f02205f6975b0a108021c97f0a4f0c20d7327ad1a0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm patterns, directing users to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://chcial.ru/uplcv?utm_term=manualidades+con+materiales+reciclables+para+adolescentes PDF link annotation
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/0e783ce7d1374b1d21bf619147278c28/zokonadojabeti.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/1f78d9c90810d003c6f8a14b2c340ecc/ladotaguxuzin.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/xiwunarotu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wugobuwa.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/18546871792.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/95260097595.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/jezetesukibadifit.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/tiradadetejizulapow.pdfIn PDF document text
    • http://skene.es/userfiles/file/61248800755.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/firenuze.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/kitijusalojigesuxog.pdfIn PDF document text
    • https://motacademy.it/file/xotoko.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/68255005411.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/95490373400.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/569a586829ef782f4d9bd3fee42003b0/69426094563.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///kusesajozumadogorivana.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c8896435305---pifobeselogul.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c189b20c0474befcba268387675286a3/tilonosemekel.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aed40c2ee---juwifiwekir.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/vigijisezovifuretu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb020d9b460---manojurejanojirawewakaw.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/52919493245.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609020a340d6a---lupevabotafejenoluwa.pdfIn PDF document text
    • https://ckmandarin.com/uploads/vimagedorapopix.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a17f851c9f63be6e8c671e3f1a1ab86e/damivavirowimi.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/gilukasijizivatoxeto.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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 18856 bytes
SHA-256: 3ac2371bd61a0735809b6e0e566f028cb42d598952af2a877ad5fd3d303811e3
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 10908 bytes
SHA-256: e807141625f60f464e263d63652d4cce4a452029f85632fb21c28013ae9223eb
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1