Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7ac088448ce80a…

MALICIOUS

PDF

94.3 KB Created: 2021-09-07 01:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b42c00f9051e75df7d38f756e8e6108 SHA-1: 75beeb233b345673f1ac770e9f34dc1d9dcbe623 SHA-256: 1b7ac088448ce80ad96d8025083ba5b893f94c7c6ee108b1845fd8ca3d80cc15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL patterns strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/32d18cc21d69e7bd951eb94f1d8a152c/wizemabikosomoverutonofo.pdf In PDF document text
    • http://uci.ir/userfiles/file/47955065146.pdfIn PDF document text
    • http://vhktn.at/images/content/files/liragekekosavamulidura.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202195182831.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/denetesuk.pdfIn PDF document text
    • http://carbonelite.ru/file/zuravexovopeputupus.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba2feef06---jijib.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/pagopamufugelosugajifovi.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210730014606.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210803060022_zdtbzb.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca73a5398---64313958412.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/3904357671.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef6f44322---xarejadinavoveduxusab.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160850384bc45c---37752977377.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/66759184403.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/95502404308.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee4d29875c---47653820419.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dae0b6cb6a---49034549876.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb75dcd7e---54928618961.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0eb9802b---23016552644.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/sexafekobumebijugiles.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7umbmea24dmliiprsrso6a6vu5/nujewidipuzuwaluwim.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2ca188a18c5872f7e8663bd7f6efb59e/kebizotegiledavasewox.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a52967e8908462b7465296002b231434/89386818649.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160875bef7e480---18706999460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=c%23+image.fromfile+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_off00010be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FA 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_02_sfnt_off000136c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C7 20592 bytes
SHA-256: 494f926c24711799a06c9e799b391255b7a0d595c15ec3b6de7729cbb25d612b

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