Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2e92a7e10ad530…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 09:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2bd582bafe5c5cb7455d3bce99d454f SHA-1: 93f27beddb26a1b5a846ec8492fbdbb8e38378fd SHA-256: db2e92a7e10ad530554e0db5ee3acc3d5cd3e676043ed980b5440956de6d8b79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/0d2bdc910c5feccd8633221578e2c9bf/41248727431.pdf In PDF document text
    • http://naturalmis.com/userfiles/file/potopelelezusex.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/9ji9h29s76f70kn2e8pg4qspmk/57575329515.pdfIn PDF document text
    • http://unseretochter.com/images/file/37565009666.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/68638567250.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/82700163695.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/bujuliwekonukixexonijidim.pdfIn PDF document text
    • http://hongdacable.com/d/files/26676626738.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad3bb42bf---notugekidume.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/s8rjcjo1ibj0eetikpjov2eolm/resunadeba.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607957a807146---sijevidizobudulesinex.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/pazubuzelezab.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b442ad13b---gixadazidotisegopove.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbb0a15c5---56836935182.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/baruluxe.pdfIn PDF document text
    • http://sdds.be/userfiles/file/lulum.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/zejadozolebibuv.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/64583162659.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/55568296571.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/60045673278.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6fcac9268---54199796870.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c4d8e1a7728---81393863434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=instant+pot+duo60+v2+user+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_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 18636 bytes
SHA-256: 681535b9488f24c09c37903937435082da59b1adedb754049b5feefcd5044699
font_01_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 10988 bytes
SHA-256: 76f5378faf90f29ba130f84fde0cb0fbcdd0d9de78373228a5837eb962df4a63
font_02_sfnt_off0001252a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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