Malicious PDF — malware analysis report

Static analysis result for SHA-256 456db82f1a50605d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 08:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 382a3d67b0b8fcb0e40db57be83d6df5 SHA-1: b558bd5d95d90cf76d6f8a8c0c9482b4b94eef24 SHA-256: 456db82f1a50605df4bbf7ad519cdca40dddb2c46933f4d1396753928ec90453
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a link farm and a callback phishing lure, suggesting it aims to trick users into contacting malicious actors. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent. The ClamAV detection further supports this assessment, identifying the file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://mrtowing.ca/Lawyers/userfiles/file/tigavopovikigepekadak.pdf In PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/xotirakorusaparulazokevuz.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/nopibe.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/11921808802.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fbac6e840---jojitivojifuv.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/69940062446.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/kijujozemawenawi.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/43801680962.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/sepizepewibun.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/tonakimuj.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/25682659203.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/mawubelekot.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/rojigafafajogal.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/giwajojamupunevetuwu.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/zokesuladojebajepisogo.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8d58175a8ceb172db9037ecf3e4cddff/jogibiwalufixitevojuro.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ijjkntias9qg40n8mnp7gu288t/gusoduxodezajetip.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/susogaxukirakapojepe.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/gikukuteko.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/3257319298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=downloader+app+for+fire+tabletPDF 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_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 10552 bytes
SHA-256: f2ba45de26f95ccb90a2042c15e93a2cab0b969f158232d3c5bb102009ecce4d
font_01_sfnt_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 17524 bytes
SHA-256: 52f308466209ae7d4aea86b943916cb8eb452bd3876b7d5ae8979f5034888724

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