Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bc550cd5735e2d…

MALICIOUS

PDF

83.4 KB Created: 2021-08-25 05:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5839d271f5b6cac890940af36e2e522d SHA-1: 1642f376d9c6361d48df7b7435144a7d3e9a749a SHA-256: 49bc550cd5735e2db1de7f95616db56e265428f607a1630861f8d0e4267d787c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_CALLBACK_LURE' indicates the document attempts to trick users into calling a phone number, a common callback phishing tactic. While no scripts were extracted, the presence of numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggests a phishing or scam campaign. The document's structure and embedded content are consistent with a phishing lure designed to extract sensitive information or initiate fraudulent transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://flardochform.se/userfiles/file/zexazutimigipijuxudef.pdf In PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202108141830351210.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/selowagefefe.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c069f000d46---70273712678.pdfIn PDF document text
    • https://bem-sa.com/img/file/fevulemorapeloweve.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b106c372aff---71147581113.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3afee66a9b---83348312905.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/fevabadamaxeboteg.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a39249232---63523885644.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/30081537224.pdfIn PDF document text
    • http://merwepizza.com/upload/file/zemuwedomupelapagosulok.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/eqhnhs37brtig3neqrvf950h70/87380236701.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/42235271720.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/96852700115.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/nosepip.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/44692590217.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/meboterusapiwa.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/jigimozejimogunoxop.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a46425c33---fenogi.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/88633491155.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087950a829b1---jagudukidipufezajesomutaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gta+5+online+mod+menu+pc+undetected+freePDF 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_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 10888 bytes
SHA-256: 90bae3fdbfc49192d6898c8f325965ae965f4831ab677f3d92794c661387d6bc
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 17084 bytes
SHA-256: 524c1bcc9e054afbec890768a1dcb023da165406abf7fc81caf9a85e3573f258
font_02_sfnt_off000126bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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