Malicious PDF — malware analysis report

Static analysis result for SHA-256 a352192ea01be651…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 17:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e28c131e0e4e5ec2534170c948f92464 SHA-1: 0bf97675084fd0281121f80d5c1d9d9b020be70d SHA-256: a352192ea01be651d7bbf5d744a351d2aedf6bf14a7ea7dbef3635b819af758a
196 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, with one URL specifically mentioning a 'how to lock app folder' lure. The presence of a 'Security software disable instruction' heuristic is a strong indicator of malicious intent, suggesting the document aims to trick the user into lowering their defenses before potentially downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://queure.ru/uplcv?utm_term=how+to+lock+app+folder+in+android PDF link annotation
    • http://constantemails.com/userfiles/file/163084023528754285851.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/poxunasirokemipobilitak.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ca041c2b---gaxovubavisoxonod.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137249904d07---fegas.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/radusi.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/dewopomurenijenumijarizub.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210910153418.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/bebafojijojalezoz.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fadoluzalexu.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/votimigo.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/mibogubodu.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/wuwalinajoxojebufogukuw.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/22103120634.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/vokurasiwituruludowazudus.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/zigogosafasudapiteg.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/feninebepibaroduwige.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/17659789605.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/nixomadid.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/74d85efb4779d3a7c9bf1cb3cc210232/17206731122.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/zaxesetuzabagoraz.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/polirukosubunagakidemila.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/76602451226.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_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 17188 bytes
SHA-256: de262e4cb62b9357eb5e34e916684247e41750e1db1adb915027ee4a638e0658
font_01_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A52 10612 bytes
SHA-256: a3c9149ff65a574ca4a331674797d21640d0fc2836cd738d40100a468c90f84c

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