Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca8751d69fcb1cc…

MALICIOUS

PDF

90.8 KB Created: 2021-09-16 23:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c391fae1713fea856b7763e3b3c9c26 SHA-1: 948a3d490993e8940a55f4093f722f9725680dbe SHA-256: 2ca8751d69fcb1cc8451c4d969db079d55479c58242b33840e679d9a619aaf50
184 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm on disposable hosting and a ML classifier flagging it as malicious. The presence of a download button lure and a callback lure suggests a phishing or scam attempt. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=pes+20+psp+iso+download PDF link annotation
    • http://alacarte-grafik.de/userfiles/file/tuxofof.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210909_070419.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/b1g8sjqm1jqr2r9dagddpirgbg/75682418177.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/73135163991.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/56610456197.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/81197120483.pdfIn PDF document text
    • http://learningkey.org/userfiles/34301791485.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/17208510201.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/79154240820.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/doborises.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/mevisoxafigosevi.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/momerakapopesurasovud.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/76233362580.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367eb3cfcc3---jozejekezorijadeti.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/xanikodikiter.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/disivurozurisa.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134844f592f3---19936723186.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/56077054525.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/kirigexafowipaket.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/38977599291.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/fojadobemabol.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/jejofezu.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/87107611311.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210911222650809.pdfIn PDF document text
    • 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_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 10516 bytes
SHA-256: 9c4cf02ffc662b0333c401c0081a600521bad13b56843c272c602153f1b42aa9
font_02_sfnt_off000120e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 23212 bytes
SHA-256: 967ba3f4570efaabb8ac61392f716177ce1f5ee822879339ec8d19d90a234f25

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