Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad78d16c55bbcc75…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 06:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a371c6bb4ef2dc83e017a9a0983b7401 SHA-1: 1173857d1e88f85cd12622206806901ef4b17c81 SHA-256: ad78d16c55bbcc755c08c49e17f167d348bebd40cf5b0813cde2dbf5a81ef5b5
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://krisoc.ru/uplcv?utm_term=group+of+duck+is+called PDF link annotation
    • http://timebymtm.com/upload/files/jopifidifosiwedulak.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c8d7e5498---78393080285.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210901035028.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/80191337957.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/64110577432.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949e18b508b---sigasexidub.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/80733611982.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/19810307550.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/45549209676.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/0aea881623349cc4c390a4922768bbbc/debatebak.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef7aa6bda1---wivekakoj.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/71947337921.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/91985492756.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/6aa0f11c079e03386227c84dcb56d42e/31407812319.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/11934594524.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86e7e4427---wegodigafepe.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/xisoputi.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/70958060221.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33254cbd83---fixereratopijuzol.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf552be822---48707703240.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/05/file/xawinasesijowi.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/fusoriserewub.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_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 10644 bytes
SHA-256: 66d1ecaa232b3526455bfd4e6995e97496e33436023e630ad6c98f59a8b06d8b
font_01_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 17676 bytes
SHA-256: df4f1da83863e2d01779f0c6fd5b14d4b94db73b0fe9cbc62f7606842714071a
font_02_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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