Malicious PDF — malware analysis report

Static analysis result for SHA-256 638341518b54dadd…

MALICIOUS

PDF

88.9 KB Created: 2021-08-10 04:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bfe20f562be8b7129abca17d04d08ddf SHA-1: 82375720a4502ded1422b821b49a1eda87dfae63 SHA-256: 638341518b54dadd0e5c245f5880fa01fcefc397415b27d5c5d4405e9db93e66
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations. This suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c002eda80c---zezikewitelenirapizofaw.pdf In PDF document text
    • http://hanarotalk.com/userfiles/file///27784419055.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/d4dbc480c11eaf71d79b15e84c4189d7/mekowizugupumizati.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/84181005893.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4fba1f663---49675802305.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/49186181264.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/fozutilev.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/31029031143.pdfIn PDF document text
    • http://sun-eko.eu/files/file/41366624820.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/ggsdkua0au55jkdfcu663666v7/gejozujopifif.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/bepuzaf.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd69766427---roximunugof.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/mulud.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160912a3d3f13d---75102506511.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/56404877225.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ce254a1bf88353b7962bb205f432acd8/55570718768.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/49456981305.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/vebivimebivigepalunimata.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784da123073---kinifamagek.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a45b302d---44208367162.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1475cafd8a0fdf53eacffce9bfc1c16e/12986038516.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/04f7ed896ce08465897f16b7d86cf041/50276737989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=circuitos+electricos+mallas+y+nodos+ejercicios+resueltosPDF 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_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 10908 bytes
SHA-256: 8dff50958151d0c7b1807b76a32260a98802572a29f8b484b929f2910cf37ff6
font_01_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 18120 bytes
SHA-256: fce08242906c16886e586dba69676db217478c3cfde454382973bb92e5328c4c
font_02_sfnt_off00013aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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