Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a5220508b9ba0b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-05 05:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e31ff4e519e3712dd126b60d233af877 SHA-1: c862d82a3735f5e93f22784c792de0cb665cb8c2 SHA-256: 97a5220508b9ba0b311ef5e7dafe1889e3510c925a71c146aa8f8cb41c1e321f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other potentially malicious URLs. The PDF structure and embedded links suggest it is used as a lure to direct users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608343b1ed136---68855224491.pdf In PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793ab781a10---wanurinufukazuvorapuxalun.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/bf6797f53a3ca0260879f3501633d4ef/mesuvimewesap.pdfIn PDF document text
    • http://babamoleskine.com/files/file/rijodejipuk.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/nerix.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052010294873499.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/892k61pciojbmrsffqrq1041qj/sulipefopiwobuvo.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/56411323865.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609178142072d---27086736673.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/h38vftbpklrepcpfhhggsimoqa/xukulokilikanowapedudena.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/kusifarigilakagifivemu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2975894b---16818422203.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160721eac304a2---28046818986.pdfIn PDF document text
    • https://faceless.me/userfiles/files/wujerakosukolimipumatu.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/tapoli.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f6f64dcf---90312841375.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/65219034709.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bamixafegari.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba79683a36---7460439818.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161149466bee8b---89202226354.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/lerolubusisajofalepebosa.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/vovajepoteti.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c18f420c32b---69078397648.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/fanix.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/nonosag.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/8b7746eb7a5bee1e87e9efcbbcd0bc17/dasijizuxuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=isi+rkuhp+2019+pdf+downloadPDF 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_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 17864 bytes
SHA-256: f8a0b1fe35049d5c3f1da43fa84845749c861cc56a32c7f88f03d31690db3371
font_01_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 11056 bytes
SHA-256: 2eba0d66a05972b1ff2840dab01d9279a0aac6b7b32d91ef32bd4f5c6bbab455
font_02_sfnt_off00013fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1