Malicious PDF — malware analysis report

Static analysis result for SHA-256 078b508edbe6fb05…

MALICIOUS

PDF

83.9 KB Created: 2021-08-31 07:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 250dea5e2d9dcbafbbb0ee4ff839ebc0 SHA-1: fb1cbc513c36f10280004c0892dd6ad914682d4a SHA-256: 078b508edbe6fb05ccf97b6dbe32186cc8c50114dc2ac9ae2014c7404a9c5690
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or appear to be disposable for SEO purposes. The presence of 'cmd.com' in a URL suggests an attempt to execute commands or disguise malicious activity. No scripts were extracted, but the overall structure and URL analysis point to a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://acecaalcoy.com/userfiles/file/38605540515.pdf In PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceba3aa1b15---88047863705.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/10554853305.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/95902716237.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/12692727921.pdfIn PDF document text
    • http://ahchala.com/img/file/8260428229.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/83c2a0d75155c356e2dc49a8e65e4220/ravafoburatolizesa.pdfIn PDF document text
    • http://qdcmd.com/data/files/60495201494.pdfIn PDF document text
    • http://blueyee.com/upload/file/221848561262.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/81022803218.pdfIn macro / runtime command snippet
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/dafiwokoluzuwasul.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/88063058747.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/11716073416.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d286e54b408c2ecd9b91580b74593cd9/xefuxawukelidufifebodotu.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/91467360043.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/xejerupemipufulajopibek.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160871a35bf30d---bejutokopedolu.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/92560162816.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/gubutelasujinijof.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/60754795826.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/75415117583.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a42d667184---kagikij.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcb179d5fa6b3aa1141fb79727d5ec40/najijeluwekapalexumaxa.pdfIn PDF document text
    • http://tcihk.com/userfiles/buvijafinuludibilagof.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edf10e0bab---xirob.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c986d3ab1b---duzeb.pdfIn PDF document text
    • http://blueyee.com/uploadIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fortnite+no+download+unblockedPDF 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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 17960 bytes
SHA-256: 2407d50eb1727c2706b538db92b84a049daed0d1ef0a91014d8f6d3d58ba3969
font_01_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001289f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 10588 bytes
SHA-256: fabfaf0cca2fc8eb006564787a72c93a4a5c8897d936e60b6e5537b08a750b5a