Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f87f98163d1740…

MALICIOUS

PDF

68.0 KB Created: 2021-09-18 21:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3d6299f030762bb3dee3e4925423f67 SHA-1: 10d5dada6fe2101deb352f3adbfea75e8b304db3 SHA-256: a5f87f98163d1740bf0dc2e545e088f47ba174bea9a5a3706d594e3027665de0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/21096652895.pdf In PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/37714762514.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qii50f06l8hvn5u35d3ir1iq39/viwepanujasitinefuru.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/79617566373.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/merokufuvupuvivegawu.pdfIn PDF document text
    • https://ratodua.com/contents/files/19997733129.pdfIn PDF document text
    • http://jinyezi.cn/upload/gomivojalidiwasopi.pdfIn PDF document text
    • http://raczcsalad.hu/files/siwibinelafekasuzuli.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/gerikanelurod.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/kimudedefezawijomado.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/64581047560.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/21325232587.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/bitetomenuweruwix.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132332ea340b---33378083547.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/21895007906.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/31923528993.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/nixojupodadofixekabavapom.pdfIn PDF document text
    • http://benly-carson.com/product/files/wikimotapopuziluv.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/sopibosoxa.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/859838068.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/lobaro.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/61477729209.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/50691223863.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/o6461f08tg14bml09nkep1fpe3/28267636820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=brawlhalla+free+download+for+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/wewawa.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_off0000b03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC855 10324 bytes
SHA-256: 5eeac56ea93d81c54e615579906877d0a707de972ef9bec1b3a97f1076aa0d24
font_02_sfnt_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 14060 bytes
SHA-256: 9fea09aea33ac2520e04459ac682d68da032318a65ad6493499791d2636f321e

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