Malicious PDF — malware analysis report

Static analysis result for SHA-256 44de2986c92569a1…

MALICIOUS

PDF

74.2 KB Created: 2021-09-17 16:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 54ac1b9644fe26a1c4e791d10240da8d SHA-1: b8a34fbe6ea790dfb5e49231cbbd8a62f4a58bc4 SHA-256: 44de2986c92569a160b29256ed97a3076e45f5f03d06edcc801b628c52d09bfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the embedded links and the detection names suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130ecc554107---74194930636.pdf In PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/zejewadepekapomumobafazox.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/65578259806.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/kubalibipijituf.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/38540277603.pdfIn PDF document text
    • http://teknis.it/userfiles/files/sevaloxuz.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614441c07824c---lulojefedit.pdfIn PDF document text
    • http://epicridesnepal.com/files/94361833912.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/butadizawazelinawuwovi.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/pesedijulozaxo.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/nixevudevosibudanuzelemux.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/29307569441.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/10944754552.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-08-04-44-15-10.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/76608015864.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/96971130468.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/7227798212.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/78963774945.pdfIn PDF document text
    • http://melabo.com/upload/files/93084211092.pdfIn PDF document text
    • https://jck.ro/userfiles/file/tikawisafepap.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/88199981093.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/zenezewosap.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/datakaxujitemirose.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007d6ea95c---napeluduzoderegugidisegud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=trongle+x1+proPDF 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_off0000c1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 10024 bytes
SHA-256: 917fdae881d198bcf6482a27f6c3208326b96bece55bb416add2423fd310f0e8
font_02_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 16768 bytes
SHA-256: 1f84e300a370f4370cad0bd875bd24dc4652039d7e762bc6cce4290bdfae6d43