Malicious PDF — malware analysis report

Static analysis result for SHA-256 2934de7e9aa0d4cb…

MALICIOUS

PDF

75.5 KB Created: 2021-08-24 10:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d1e2e95c9f160c9c7a12e2644a3a8aa SHA-1: ef20ff645941eae07e5bad94ba71514ddac73016 SHA-256: 2934de7e9aa0d4cbbc4a61e91130568e7ece81c279807fe440ad16b53a493d28
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://gibisch.biz/files/files/7999888691.pdf
    • http://atol-res.pl/uploads/file/69589337409.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb954eb3ca---mimixup.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9b3aca09---88141410338.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e23df54c2691470fb9bbc08b248f3f59/56495953770.pdf
    • https://trungtammatnamviet.vn/upload/files/73370727091.pdf
    • https://tonmathunglan.vn/upload/files/bibox.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8eb1e8f10---bakotor.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/033ae2512bbfd8595e710576f90a9d9f/sekebojokowomajogonenotur.pdf
    • https://sanruouvang.net/images/uploaded/file/livezanewopozi.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fcd383012---dafesimoreduxasave.pdf
    • http://tt-ural.su/admin/ckfinder/userfiles/files/23810602992.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/0kc0a2jr4l24vleoukgnvi836d/17390970906.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/78e9fdc05cba2a47be2024ed8b2b399c/jatejerisugujan.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/95c526db178402ad54e50d8d8045e854/zidejawuluzogekavugaguje.pdf
    • http://tetraeng.it/userfiles/files/doxesewuwosakavagilodu.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecef923e191---84365247845.pdf
    • https://avvocatoboretti.it/file/61208567232.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/dcc1be373ebb93696672fba372db8e4f/medutev.pdf
    • http://cayxaotamphan.net/userfiles/image/file/97430308846.pdf
    • http://drivingschool-brno.eu/files/jazozigasiv.pdf
    • https://lordoptika.hu/files/files/defetopebezir.pdf
    • https://angelsstaff.com/uploads/file/xirupu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=2018+exam+papers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c625.bin
461795d9d31ad348205fa77eb896fa3bd09672cefa60622fb0069cdb2c240ff4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 16400 bytes
font_01_sfnt_off0000f0b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 16792 bytes
font_02_sfnt_off000108cd.bin
1b6e9bca10b388154bc44505d950b71fc36971fb5407f74badc495fcd783841b
pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 10460 bytes