Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc3ede61d161c1d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 16:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2f683e3b4df144e2f924a902a7d9b85 SHA-1: 99235cd56551a4b1586e52b90a0d3de19f2aa223 SHA-256: 4cc3ede61d161c1d9b743747174f2873d20a1d11b131012c8219fe91e5978274
204 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains links to algorithmically-generated URLs and points to compromised CMS upload storage, suggesting a link farm designed to distribute malicious content. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://skpizzasubs.com/uploads/files/jakalid.pdf In PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/67192605991.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/7498173798.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210528040820477.pdfIn PDF document text
    • https://norservis.cz/files/files/26099922.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/92982361544.pdfIn PDF document text
    • https://anjingliar.com/contents/files/82542025450.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/49102b91cbffbe39d7adb9f21b7d73de/10236910846.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60db49b2bd6c9.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a64d9caf---2719271320.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/vijavovese.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/lidixove.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d9242b6ff1dca5834b755121b0b2f19c/35644411266.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ff7d61a3e2e9a064ac3538bb27d536f6/kaviguzunabowelex.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/914751935c8a69ad3f7f8ed7b9077000/320187838.pdfIn PDF document text
    • http://velisend.ru/photos/file/75547334081.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/61021126018.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/jaxumolelubovanetodowof.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/84605996674.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7f4fee07b---lafaje.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/gimejitupi.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/fulikomoji.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/70340450318.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/b10d27d7dfd5e29a696ce9a8ec8dd59d/nunuxipudigisalazobev.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e759b586848---28847630723.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/79118608090.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/562c7c634e62edbd4c1013ed4128d4c3/wudigide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ap+polytechnic+lecturer+syllabus+2019+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_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 17716 bytes
SHA-256: f809b626e7d479ae85a686ad2062576370624eb6addd75ddf86bafff0bc88060
font_01_sfnt_off00011308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1F 11516 bytes
SHA-256: 3089de00e8f21a9655c472589140d6c1fc49394a5e06c102f625477a47213a91

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