Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ff820d8f02336d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 12:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ab20856b03bdb2f82d397983864be29 SHA-1: 55dbe11ca0e7681c2961f9362e65ad3aee4bcad5 SHA-256: 34ff820d8f02336df5adf49e0662275f169615dd7873e96c7568a9313302fdb3
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised CMS uploads, directing users to potentially malicious PDF files. The presence of urgency lures further supports a phishing or scam attempt. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to external, likely malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ddb5d1420---kivexosu.pdf In PDF document text
    • http://kursadowicz.pl/Upload/file/sezukutodiderixa.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/45415036597.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/63073465731.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/tetojokamumozaw.pdfIn PDF document text
    • http://polletnv.be/uploads/files/jadisanaxo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3ed837904ca4feca9c45bd2f1246885a/dituwukarijewevobiniveg.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a65fd7e2bb---81162457987.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/16148256486.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/vekewivemot.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/dec2cca9af23c24c26d490471d3ee23c/viwajujivuxolesimopoliva.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/dc3ffaa0becfad8c0939f0f7333f48dd/62434255316.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/16134258931.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087816acf102---20331299356.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/74858692876.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210630044847032.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/8035690169.pdfIn PDF document text
    • http://abwessex.com/uploads/files/lorujuwafapotodu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fde9d8d7d2cd6202033dff7e8ad3d955/47458283559.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/jonawewuwixenipo.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/pofugedufonibebaluxil.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/gatewavog.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff8c36292---zidaj.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e465df35---kazopozod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=clavulin+875+bula+pdfPDF 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_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 18608 bytes
SHA-256: a78a72f61fc078a1c7a35053b15ad84f2bce950c08601615fa742ab3237fa664
font_01_sfnt_off00011870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 10604 bytes
SHA-256: 49410fb853508808e2821026e959044f5fb7f823ae00110d65fef285763235ae
font_02_sfnt_off0001309f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1