Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bf0cfebca052db…

MALICIOUS

PDF

168.3 KB Created: 2021-06-26 03:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee342e719cf5c88bd56d37d9195f9fce SHA-1: 6cb2a7d673a971110855788ac1064b6b385fcaee SHA-256: 37bf0cfebca052db6ac6c8478e49327810879278f1f3b25605982b3ae8ee4260
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • 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.
  • 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://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/46e92cc4586792ce5dd40d1b2702d30d/38062754142.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a1c48afb868164b7a9fb705a1ad1bb9a/visabewizatasi.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608156d5304b7---43171686467.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca3ae970d---raxalatogijibes.pdf
    • https://equator-maritime.com/userfiles/file/lolabit.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ghk87478ojnvtf5hb5apcjv85v/miwuf.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609087ac72625---40400200406.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/5uedv2ibbf8t1tlrqqjep05bt0/vuronevixupudowuvenuxuru.pdf
    • https://hometeamcorp.com/images/usr/49173986245.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7n0cb3du3ji5usro7fm7mp6eb2/remoraji.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/2e4e93a7dc585c07d4e50c1153422561/fabogowilabovananapewi.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/u95em5i5gjln6c3m5kaa6mj7u6/87638993032.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607978a662183---83335015383.pdf
    • https://mfdesign.hu/files/file/wawizo.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4db768eab03d6e74b0eed70bb4ac7b98/11666314072.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba984787201---23781790906.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/j2lkeim02eth9fs94mdqfdejvj/32079211854.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/34178017136.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/3lfkt02aohcfvjps1k7vc5pqc6/mopatusitenu.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c09bcab6532---lubakatiwibibako.pdf
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/sigusugonozebojumabedasa.pdf
    • http://birzebbugastpetersfc.com/files/file/neguda.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4vm91sq6g8gsmbca6kikcdcd83/20214590147.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf2cb4b164---59358875951.pdf
    • http://africa-emergence2019.com/userfiles/file/povufarimezixegi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=showing+great+enthusiasm
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023490.bin
3fd5a4f24d8ac52431f05ecf247facf689477dc53ebb054d2e48902253e6c67a
pdf-font-stream PDF embedded font (sfnt) at offset 0x23490 10772 bytes
font_01_sfnt_off00024d45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x24D45 16792 bytes
font_02_sfnt_off00026557.bin
32a6804b3dc8253d312b4ab7bf7749114082cbb90867673f4702c81787c67adc
pdf-font-stream PDF embedded font (sfnt) at offset 0x26557 17820 bytes