Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b71de406f834d1…

MALICIOUS

PDF

83.3 KB Created: 2021-08-14 01:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37f9b686fb52a9380a7c1b4c0bcf4cc5 SHA-1: b22cdd6d3cd8d87862d8ba23f48361e500b4418a SHA-256: d0b71de406f834d13fc5028bee65c3e037a868ccd2d364256d7cee368eccd89a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://avigailpekelman.com/sites/default/files/file/bevodotatuxenevukimibe.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a56adfb023f---bozuwosizekifefuredo.pdfIn PDF document text
    • http://szwygs.com/upload/monekegeverepejodewalipi.pdfIn PDF document text
    • http://splogservice.ru/content/file/16626008926.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/xolerozonezipomomejebek.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/katokuwi.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/11344241798.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6254a003a7fa55038c1e92ae9c5644c8/molubojowowixejoda.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc015da19---xixodixetuvakane.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a223ba68b---81044866968.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/ximig.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/00357d9933f7d807c3e897ceadcd225c/razifebusoxesuravegukebi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/durhj9vg8tp4to7g03t3ledao3/pinoviwudebalax.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/95214859420.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac755f405a---67109380112.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2dd1eb449cce8f0a98fe0a1e6e9a19b9/52302277356.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/72115467951.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/tolijepip.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/eeovgdlr1hmljjtmorl9qhc1u6/7172872710.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/kodojovuxetetubudek.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3kejndqgde913mql9cdpo2t261/59078023304.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/5710446098.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/mufilunudajogejixetoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=reported+speech+exercises+imperative+sentencesPDF 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_off0000e0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 17424 bytes
SHA-256: f835812a27ca4e35abaa811a95c3f9cc1c0319c6f1479e83d73cfdc62756b6c3
font_01_sfnt_off00010e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E29 10948 bytes
SHA-256: 6cd969250049f80ee4b64f7bee8f61e0e7ac4e3574a7e8612cbad3e485e31b60
font_02_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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