Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bd9d720031210a…

MALICIOUS

PDF

85.1 KB Created: 2021-06-30 03:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6c28833a72ec5a8da7ef5d81403d115f SHA-1: 2cda2d738206a09a956441c2b76bda753452ef9c SHA-256: f2bd9d720031210abfe3a0b44737bd9606412b727df2cf821d0ca219a2d1f6b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://bettynblue.com/upload/fck_img/20210515/file/sufezoxut.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1a156b3a---70819961108.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/18351334108.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbf55c2549---90121695557.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/6a3e90al7n6vsp0n64npshqugk/61308113276.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/67980810035.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/nerubov.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/gafivodegizofoj.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8495b82f94075c9c53c14ee1747cc69d/37535056279.pdfIn PDF document text
    • https://vestol.bg/files/file/mejum.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bc53af14509---56146806310.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8058baa2946173db59090d636761b259/daneduvewuwulukotifobagix.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/aeeb503751310f4e85add6bc78f498c2/jibuke.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/dadogojibefevefil.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089955be4a9d---webapokomoganitiga.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/18216336913.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19a6c3a9c---40674825159.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/34492498068.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fc0cf2132---senaxudoxizotazokujolakik.pdfIn PDF document text
    • http://congtyvima.com/images/Download/ximuporejobuwozez.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sbdethrpjfgao9juc73ronb550/4926808637.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/v5ujfoo3ns03a7dqhq5sth92rb/bexakavadasol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=geno%27s+pizza+and+burgersPDF 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_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 17268 bytes
SHA-256: 3afd309bc2b00acc471d6ac4fe6229d71b9a72afba620781eff9e932ae3c164e
font_01_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 10796 bytes
SHA-256: 7754b0914cab67bbdede8378e3e01a29c7835aa11bf63ecc07acf696b4c5e8b7
font_02_sfnt_off00012dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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