Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37342351ac0602c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-14 09:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e43f8919a5e332daff4f1495cd69b1df SHA-1: a01e15dbb0b2a562c55bca6eb6283448bac2c73e SHA-256: d37342351ac0602cd1f04c5c47e72a959463492c8ccd0c2f207cdcde46c8d0ce
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it is a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users. The heuristic 'SE_CALLBACK_LURE' strongly indicates the document's intent is to trick users into calling a fraudulent number, consistent with tech support scams or fake billing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 https://suacuachuyennghiep.com/uploads/files/29708946117.pdf In PDF document text
    • https://icoachyou.biz/images/ckeditor/files/23874396872.pdfIn PDF document text
    • http://esistore.com/userfiles/file/22289430967.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/75497109475.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/kipijukafovawudidujinarez.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/kigekakitase.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc628396fd---69606194467.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/19555677324.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613284bc2d721---mopumosala.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/79680951772.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/vazolunabe.pdfIn PDF document text
    • http://sdds.be/userfiles/file/tumerekewizijavu.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/petewusipafivazas.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/31741065896.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/tefegoxutogowigepitone.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/42789157059.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/68350979424.pdfIn PDF document text
    • http://wernitznigg.at/files/67884893456.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/xuresikapajorulorituvuk.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/15719244384.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/56041468531.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/17973178673.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/sikasopadosixub.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138542b8c8e6---70626431343.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/12641253234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=skin+tools+pro+free+fire+apkPDF 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_off0000cd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 18052 bytes
SHA-256: 8729bf40f35f652ddc3c927876bbe7c4cc80c6a903811a8c16295a4819f1b07b
font_01_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11458 10516 bytes
SHA-256: 671c9955c43bb86f21e41275b808b3ebde6b850f1b191673e11d20e3a723f308

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