Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9ea1af77f900d5…

MALICIOUS

PDF

68.1 KB Created: 2021-05-04 04:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b988094693ecb1b5055c4ab06d95c5d6 SHA-1: b0b78546aa832a66ff5a791ef9036eb5017803c9 SHA-256: 4a9ea1af77f900d55d0af7ce499a0a981eed569182e2648088f57c19fe03cad8
154 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous links on disposable or compromised hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9684

Heuristics 5

  • 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
  • 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://amphorabeautyclub.com/campannas/file/74131228445.pdf In PDF document text
    • http://altinay-law.com/images/file/56828736641.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081624f7e058---68799398484.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b61f02a29e---wogegezufob.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1048eb4321a2385101503fd80f41f54c/88085913923.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ae482ed---rajogilarevogikogaruz.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9utk7702j1d3k0nglm0lhft4e7/kewuzorutuzujoxim.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16072f11a17038---kuxuwufirunegafine.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/56j5gune8ahet26skkusn2hqo5/97938364905.pdfIn PDF document text
    • http://learningkey.org/userfiles/96636309253.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7057c6c0f198749104efeeedbe3e614f/tapopunojeluveviduv.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2ae25b909---60919737734.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6964f1a60d7086973993cc925b44f676/83214527343.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/mubekodamadaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=inductive-+logical+thinking%2528+cls+answersPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 5464 bytes
SHA-256: 5152cc706eaf9749606690a9aeac601a992415ce7ff8016af7ad8220184f7a2b

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