Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64027ed80d09b26…

MALICIOUS

PDF

73.8 KB Created: 2021-09-25 20:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac7384e422b68425053a673246ea313f SHA-1: 8e972a863cfa18a629ca232ec51acc0f477b96e9 SHA-256: e64027ed80d09b26a955f20fa56bfc443fd91ead01f8690cfcf2efaf1ac03674
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, but the presence of numerous URLs leading to PDF files suggests a phishing or malware distribution campaign. The SE_CALLBACK_LURE heuristic further supports a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/bisiregapuzaxekobonu.pdf In PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/gizikunidefabonagum.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/22740029121.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/53049565432.pdfIn PDF document text
    • http://eva.am/files/78d361324ff057b0.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109132257161664.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/lamogoxevadabosomew.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/sezubuta.pdfIn PDF document text
    • http://praguetransfer.com/files/file/riwanufodonul.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/wazuriva.pdfIn PDF document text
    • http://charontrade.hu/data/file/33923167567.pdfIn PDF document text
    • http://test-immo.com/file/sivejuzegufumiwovumusamo.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/9140538455.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613b266c76bd8---nirugi.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gimirusowixapax.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3757b371f---zibabenowadaxid.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/30803137454.pdfIn PDF document text
    • http://benrassam.com/uploads/files/nobonoretisumego.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/74533874803.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/zikaxajijug.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/11096737595.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/16850423159.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5e3f2905---wevoropo.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/dimesuzori.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/33682189779.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/xiweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=boruto+naruto+next+generations+in+english+dubPDF 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_off0000b766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 19304 bytes
SHA-256: bc8aa3b5aaca7720ef32f65b0dd179f55f4058a42415f561cf5fa50b74d1a033
font_02_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 10924 bytes
SHA-256: e35313e07e06b6ec19ccb23846260eb8a574bc17a4742b8803de09eb7f3475b3

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