Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c00238145064f6…

MALICIOUS

PDF

116.6 KB Created: 2021-09-08 14:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8181f88053ec1b4c50b4a06a11620da SHA-1: 804135d8088ee03c779142e528c2ea6fe22f3a6b SHA-256: 85c00238145064f6dc49431a7a47cea954604929c1f0b2bbfcd55ad66c2f902a
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern appears to be luring users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=ad+art+bkprmi+2018+pdf PDF link annotation
    • http://patp1ryb.ru/media/file/38176990263.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/07f1smq57shuoua0fb4q3d3310/tegisozijunez.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/8804253659.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210907001553.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c22d07236fe67cc943736cd3a26cfa87/lilupenonawovonule.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161329b42d32a2---xisiwate.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/75240150138.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1eedcc9a7---42295214572.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210905_2AC675C071E9B549.pdfIn PDF document text
    • https://o-dance.com/upload/files/42645807533.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/75863313047.pdfIn PDF document text
    • http://www.heksan.com.pl/file/tigojuzamovu.pdfIn PDF document text
    • http://woykoff.hu/upload/file/jotorolumunerevovovugopu.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/xowetatisuguz.pdfIn PDF document text
    • http://ombs.ru/uploads/files/15589692029.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/gesuduj.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109012225295314.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/59738445980.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/kevumevazawikego.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/devojagaxexadolewegozad.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/32003016959.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/pujeka.pdfIn PDF document text
    • http://xfswchem.com/upload/files/80766092648.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d40acd0f9---vadonebakodepanorumevagig.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_off00015e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E78 20324 bytes
SHA-256: 72110f1895a9555f71bb3c387dee16a97b53388e5ac027a7feaff9f7e703561e
font_01_sfnt_off000193a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001abba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABBA 10804 bytes
SHA-256: 7268cf2107634eaa13781e8b01a666ee8108a37834ef40951af480b367bb66f7

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