Malicious PDF — malware analysis report

Static analysis result for SHA-256 68199ac9a25afcd1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 21:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a33f075b9538acd7018fea8b647b1575 SHA-1: dfc32d835bc49ca40fcce99c2a133c6e101f35ce SHA-256: 68199ac9a25afcd179de47b93faf4b2bbcb9b8872a5bb1595a1dca90d143f1a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this. No scripts were extracted, but the overall structure points to a phishing or malware delivery mechanism.

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 https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086cff7351f4---43559432534.pdf In PDF document text
    • https://tecnibat.net/uploads/archivos/9802966384.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/gesitilagexelufilo.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/93833011930.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610a02385575c---madokif.pdfIn PDF document text
    • http://arablift.net/userfiles/file/85171264909.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/nasagaragakatunubalipebe.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/40452882962.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/79fb064bf20ef1e7f7c4fb44d514994e/29780216572.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b9400875---ninuv.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/90553799038.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/97911607493.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d7b1ca87ae949371d7308dceb271457e/29966865570.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/48670795653.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/nevizo.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2acd87f26---14503695675.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/59673518154.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/lizuserinozerufodabubus.pdfIn PDF document text
    • https://premiersuli.hu/files/files/86816114383.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/momimeje.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee49316306---dutamazebivori.pdfIn PDF document text
    • http://bacviettech.vn/userfiles/file/66535553900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=br+martin+nuclear+and+particle+physics+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_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 19052 bytes
SHA-256: 8aa500b3d92a0fdc4e09de3744a7c4d166728504a5730c600373f7b509df8fce
font_02_sfnt_off00012288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12288 11032 bytes
SHA-256: b4062d10247efa1e7bd1b80b97961594d8bbe8cb559d8a80d33535516b0efee9

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