Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd83a90872e62ac…

MALICIOUS

PDF

85.7 KB Created: 2021-07-01 23:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 388c39cecc8f7f92438f00d52d3bd033 SHA-1: 6b6f274789b04d410e03761de717c64ef8d724ee SHA-256: cdd83a90872e62ac1e14aa7ef604c79714fc4645058e51cd9dc5ef13c3a8e7ef
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. The PDF's structure and embedded URLs suggest it is used to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jacukq22jii0r35r70f3a20kd2/dumakixibemotuz.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/5gqv8aeak1g9kka7tehci67aq6/75213132787.pdf
    • https://blugarden.eu/file/12042802402.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b5btd64ddvvtqte2nol46p1cq1/58683687871.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/vodikijotitegilalaj.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/nenapekaxi.pdf
    • http://yilip.net/userData/board/file/barorodemew.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607734d18b605---jisotoz.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8056d548d---pevobuvobokonu.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/12772a8121d0fad42272d7f183afedc1/komedukogozisinivemob.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/9a1e19c5336199d1dd6532e836691edf/jatakisikofanixeku.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab81a0b62---89172893558.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a581bcf7cd62dfdaf0bdeddcb0051fea/26364482453.pdf
    • http://indovinandoilmondo.it/themes/userfiles//files/46479542096.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5d3dde05d9f0a333ca51dd5ffc215070/selawejoxagazi.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160795d440aef5---zujanarebimevowisix.pdf
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/25589634133.pdf
    • http://sarljarry.fr/userfiles/file/75462062407.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c449d6e39---dipipotogopa.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/cd3351984a444e9ec37e543aa936c40a/44472208734.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b67fadd010---rokaralerabemot.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/999c1qa8s1rvbe52cnb967uqk6/52899667969.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb23359ab4d---48767004945.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/92462811fa9ad30c949bd12fe6b956cc/kupoxowutam.pdf
    • https://activepymes.com/pub/file/kipej.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pdf+constitution+of+india+chart+hd
    • 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_off0000ec6c.bin
480da773276701ee3dc82b99de24dd510efc852896b254ab207f235f89f04a3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 10496 bytes
font_01_sfnt_off00010440.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 16792 bytes
font_02_sfnt_off00011c52.bin
189aab61ea1a638416522d46f84f7ad22a632ddbb1f3a6ffe69a1d1dc3bd5819
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 17196 bytes