Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa7cfe03b70bd97…

MALICIOUS

PDF

89.6 KB Created: 2021-09-04 15:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f19e2b5539a58faa291f2344f90bc23 SHA-1: bc811f645bed75e0db5c4c4341e34de1d0fafed7 SHA-256: dfa7cfe03b70bd97ff589d7642166db4e5d9e993b9ed872cfa013a055f3772ae
156 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. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6d395f84dd5ac0a7af73a9a31932361a/86613643611.pdf In PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/d2u151dv7l14sfgj3vnu07vpfk/faruwo.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/vemisegejojojejakida.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/49154545969.pdfIn PDF document text
    • http://groupkaishan.com/d/files/30789161390.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec40d82729---tizovamoke.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/467dd8a66e45ac0acc8427771dcb96a2/neganidu.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/tovatobinawivupu.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/rabokojizumefabolefalaj.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/kps0o4tt38c8i1h3ipd36d9507/kovojazoromatifulujumuke.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8416390f8---nerotenuxezizagogero.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/75054768835.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/nofarisopujogut.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a03bd8426---38430375872.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/55680197944.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/82870662353.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/givobamaz.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/26163392988.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/gelevemelelaro.pdfIn PDF document text
    • http://rhondachem.com/d/files/75297591820.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210528050201.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/besasuveguxezojoxavaparil.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f1486ddc6d05c4f8ad694ece77abd5ba/64456011125.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/44759181792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=infrared+security+alarm+project+report+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_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 11076 bytes
SHA-256: 8b771fb14be2b2fb765c69c932221972fe84f6b52866ab0a408b883c8b80993b
font_01_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 18040 bytes
SHA-256: eff99f87f0c5b70d1a12ca8dc7daefdb4ab06fb3bfdb06cdd5c81b0f865f0609
font_02_sfnt_off00014089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1