Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbe3cefbdeea97a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 19:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a47c0764c2b1b53091a28ae417a77186 SHA-1: ba053ae35bd30dd7d19cc7789a7db7533350e45b SHA-256: ddbe3cefbdeea97a63d2b2858d5940e01c618a40336f916318c076ef20a8d920
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=abrolhos+islands+by+boat PDF link annotation
    • http://aep-tc.com/cache/fck_files/file/bowozemiwegarab.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/07fe36aa4e1de36db61163f244bfdae3/87403131576.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/gonakubodaxudef.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3a8e05483---woluripowe.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/zexivejotamuso.pdfIn PDF document text
    • http://ashioke.com/images/library/File/39431994005.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/2219498791.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/25459537523.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/235m45ft6lom3kbi09i6r6v59e/21519853742.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/124iq0nkpfvafh1lbt01m2qst3/nasimelamuzeba.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/aeaaf65c970c72e2240dabbed7989b8b/pokutetuxulatoluso.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202108141318537358.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/daketesemifurufuliv.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/kuvorivewivolefagad.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2c3cf2683df7decc1f271302b28cdb96/97512273921.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/gusokemekar.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f74d72e2c---kijumuno.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/33517089969.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/qpopo1jbrn20r6o0uf1jbgeasm/47011336815.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/15363955359.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/35155769449.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/5oa7sf3mvtssf6iigotrhilkfi/35280498400.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/vob5goqr6kvgq8v1judk33g6d0/95282082483.pdfIn PDF document text
    • 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_off0000d23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23C 10448 bytes
SHA-256: fa55a31ef2742ee81f42df4b8d919729ce309d938e6cbee68aeb4c3c22655226
font_01_sfnt_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 17860 bytes
SHA-256: 5fe85da1572d0355d25e23831c827e69a56f5970f3c55b0c278dbbb8ac4e794b

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