Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec58b4bf2b6f9bb3…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 22:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7825d1569a8ddf770e9b116b02411b0 SHA-1: 61d71f841fd448e15749d30dba675438bed22bee SHA-256: ec58b4bf2b6f9bb3dcf370d5f9b8ab3c771e7a3b6450e9f6b2e85768345e7bcd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566 Phishing

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics and URLs suggest a credential phishing attack impersonating PayPal, directing users to a link farm hosted on potentially compromised or disposable domains. The document body is heavily obfuscated and unreadable, but the presence of multiple external URI and link farm heuristics reinforces the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bastet+ana+pdf.
  • 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://matras-devison.com/upload/file/4796747946.pdf In PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-15/20210615212339566442.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/18599861884.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607415ae169da---70154689627.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2bce79f1eed55822b74e01fd54e17882/lupisepuwuvefilunugamiwol.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/84342817019.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/gupasomukomo.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/518c7ef9a2abae0984a4a6da8c3e1575/vizolugutugogesopujata.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5606f573ac---75454960639.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/9luc72opho1tcb2koi0836g1lh/73489924993.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/2434133015.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/4687782442.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ef066f74894f5d3855370a81be93297d/91322326897.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/88482627588.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c126886f6d8---9425627630.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/41619199690.pdfIn PDF document text
    • https://onwater.my/uploads/file/96805365236.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/6719490115.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/ruriwafotinig.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ca8551d86ccf3d16b3aa36b453426718/26243454041.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e2413f8b902---56857571064.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/91093895505.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/15673665956.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210517213408.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/letarerowexar.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/zupovewufofedetom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bastet+ana+pdfPDF 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_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 10184 bytes
SHA-256: fb561bd471c4ecd4b985f756267611724a6ce5502fd1d9a882f19fdb4ab33f8a
font_01_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 19416 bytes
SHA-256: e0a31b31aafa2dcdc0af689ae9bde0e483d92a7bb847ecaaf9604dc51881d3d9
font_02_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1