Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b08eadfbbcc4c6…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 22:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d4440b99d010d4f603b7bf07714be53b SHA-1: 376629d71ac42b4202662a97d91d2e7c65cc161e SHA-256: 72b08eadfbbcc4c64e1e41fc0aa406708e008440464e647f71c478417047e5c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0c2b0bf1de0c41745726008b93e6ff58/suvobibukeziwolutepuvevat.pdf In PDF document text
    • https://ppkh.net/userfiles/file/45859120915.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d6c636b95---75188003075.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/vuxij.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/eaece27fa1677fc9a1838b44d5a52026/resijopof.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/gewel.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/dubune.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ab36f2f9---xujovape.pdfIn PDF document text
    • https://kawanmto.org/contents//files/rifimobitut.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/tr600kg27v8ps7vu8l343j3cre/12591446258.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/danipidubifogafuzam.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84cc104e69---89396094382.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57f69b6f74---94771330213.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/lidavinuwonegep.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec8413742f---13222235422.pdfIn PDF document text
    • http://beateromer.com/bilder/file/52110930961.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/l1vn9sjun3bhnb4h0qgd5icq21/21814181634.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/44669926625.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/lupuxarusubogabalifutew.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210719112449888767261.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/31aac451973e9af5a286ff45b4826d76/28032333037.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20218251610431053.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/42393499231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=husqvarna+automower+450x+technical+manualPDF 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_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 16952 bytes
SHA-256: d3764131f07cf5df155f2210d9bfc498033e109fd79d3f1e6330bb72b91ef11b
font_02_sfnt_off00012774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12774 11320 bytes
SHA-256: 4db43b15a80aa0459747ddaaf2f2208da711580be2f189805d986f6138462224

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