Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c45d013dae1513…

MALICIOUS

PDF

87.8 KB Created: 2021-07-05 13:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0bd4d0625a9fbded8b636c87538f862 SHA-1: 26d64bf60db79ab4fb7c2a80d354a3f45f1de92e SHA-256: e0c45d013dae151360d484eba24cd9e49234fd50ead71d7f37ca4aff30b0c46e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites that host further malicious content, likely for phishing or malware distribution. The presence of numerous links to compromised WordPress upload directories suggests a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b06d20beba9---48769063078.pdf
    • http://drthchowdary.net/userfiles/file/93058494858.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160743697efde8---84846791147.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/447b9f9920ef097d5fff3a226e893d58/7443528087.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/vcf0bnmsa0ll8it9g5bep1nhvv/88892377873.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b07cc3b0f---61274018637.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f59893a9755a301e601a3b3dc8a1b4a0/xujisexijubidexusirilu.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d0354925213---12385211208.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607857d18c07c---26578334854.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4cde6b87f---5025501170.pdf
    • https://room12shio4.com/contents//files/74819213324.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071d284e73eb---12464498150.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ede2c63fa3---tazalopigagewobeb.pdf
    • https://cafe-malaysia.com/contents/file/tuzowamipujunubota.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5f53f3f37deb6f7150e7c4295f6a98d9/98006141791.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/hrqvect0vk9ht0ch534fuvappp/wobowefafuxolonatape.pdf
    • http://wingmanplanningdemo.com/userfiles/files/78488719066.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b81737e28---vumenunuxiwirepef.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/42020137735.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/df77sc7qi83nt6g8dfu9heuhj7/mavudaliwolin.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7543d8b6fd637347ec2612461604b302/4411865605.pdf
    • http://savaksangida.com/resimler/files/68982312256.pdf
    • https://atraba-holding.com/userfiles/file/99076479744.pdf
    • https://menu2uplus.com/images/file/pisujik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tree+root+pruning+techniques
    • 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_off0000f6b2.bin
a21318cdf9b1898958dcd7628a777cb16a33a898e5031da2e9b7a67dfa1ab4f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 10656 bytes
font_01_sfnt_off00010eb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 16792 bytes
font_02_sfnt_off000126c5.bin
27a5179e9b098d4ac972b72f7f04d2601048e304a47acbd521c6cd720771b573
pdf-font-stream PDF embedded font (sfnt) at offset 0x126C5 16632 bytes