Malicious PDF — malware analysis report

Static analysis result for SHA-256 810091c0f3803550…

MALICIOUS

PDF

82.5 KB Created: 2021-08-24 18:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a322bfda5f0528953e98850483f4924b SHA-1: 045ba17a3e54ff835c636605a034b6e6ece0c8a6 SHA-256: 810091c0f3803550ee7694814b72cd6b792d5edfb1bf7d1381ad29e3f5bb2c06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content or phish users. The presence of these links and the nature of the hosting indicate a tactic to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3dbce8bac---81846909719.pdf In PDF document text
    • https://whiteplacard.com/UserFiles/file/22989114393.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4a3cc521---84495872329.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/773919339.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/35736a9bcf389229759d1337fc15a7d4/dekejigewirozafewawor.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160895862bc05a---26541530271.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/wirajisedilaropasekorafa.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7f2f0b2ecdc16b56496caf5145dca8d8/tijemuloki.pdfIn PDF document text
    • http://goref.ru/files/file/vafizivuro.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/80003205574.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e26omfqbki2k9ieuqager7nrs1/41984632501.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/fisigowe.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a54afc114f4---34030835858.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/89489784185.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/57492690471.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/30220f3f931462f87aaf80af760d0998/nifuduzisadisuj.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/74283389399.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc0876c3d4---kewomapanam.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/logubopol.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608790b78510e---safibusafikurepuvixitax.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7efe755289---dafigokumabili.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/4d3312ab0516fe14f45f4d016543e844/78708554636.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ed6203d1adc8a82494659fb0ede8d777/76605524542.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/72323325011.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/09b855013b20fd0529be2e7e34f81770/80340082988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=weakness+of+legend+element+in+dragon+cityPDF 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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 17908 bytes
SHA-256: a3df17d25788a277e2a24f52d4cd6d7c588b874f1f0b5a4c8d6fe77b2b32f035
font_02_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 11016 bytes
SHA-256: 1109f00e1062c7646e94286a1dae7553c6dd90849fc619e61a2aa4b0d4144a48