Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab96a3801af57099…

MALICIOUS

PDF

78.6 KB Created: 2021-07-02 13:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f5b4d36a3f30aadf04f3f3fa705210ef SHA-1: b55124c45289254e3f93aac71fc335796d0a1dd1 SHA-256: ab96a3801af570997c1f368bae89965e4866d841137d29d8143e42dd05eab4d5
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b62db1a78---pereferulixuto.pdf In PDF document text
    • https://zoorichi.com/temp/fckeditor/file/96557314874.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b5acfcd0dc8---46456636121.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/talutiwekafezubeto.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/214047c7a70e75dff570a1ae72d7a79a/jowudesavew.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607959923e235---16355137192.pdfIn PDF document text
    • https://nadamasristorante.it/file/63096622776.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///vatosugitasovu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c8623aeac24---rewizazizenu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3848005152101499aca5ebfbf0e11bda/duvupulowigilotesepoziguk.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f250895c7762744842cd1c0631c0d18/111236092.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966cfd22b69---gudugaxenilibetofo.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/40466683289.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/3ba4823c747e1f57b7fbf95c0e4100f7/31801061774.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/fadirewug.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/43um7687viq9a56n4tg1bbcft6/26794127071.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2a300q1855ne48v7pe3mm2l4e2/27336210899.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/69722534711.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/vewerunikakanoso.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/58f028243a716a34a37a7d66807b8e6c/fipapatu.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/rexasaxogu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9680e75f8---raferifejukalodafakofu.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e5bc36a1a---xipovodebewovizimukut.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/9d6c7b61d25bcc2079b2b24beb09bf16/56663266699.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ojfn4cnehihtro39j5sqveed9s/54025177542.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16070b02cce29e---rafegazoxabevuwovev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=airway+courier+trackingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC366 4076 bytes
SHA-256: 4417a88fa9f232dca409a7ed07105ad5de104bea280a7e9e35b0f11ffc0b1aba
font_01_sfnt_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 10564 bytes
SHA-256: 9c50bf283f190923f368647e6aeeecb22eb74015e1e6327e1db033c0e55743fa
font_02_sfnt_off0000eb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 16220 bytes
SHA-256: 4d005e83b67db2910e751f1207c56caf9686b5744503bfb42308824092d71509

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