Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0a97db5afc14c3…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 01:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81c8c56c5a64afc89cff304867131660 SHA-1: 0bd879cd341dc97336ec7869395ccc17cc2e92c9 SHA-256: 1f0a97db5afc14c32e708a457585d60f0bbbd13b738cf8ee7b48a1abc574e230
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, forming a link farm. This suggests the document's primary purpose is to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://takarasushimn.com/userfiles/files/93992660029.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376747a5dc9---71043166131.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/65492854445.pdfIn PDF document text
    • http://anm-av.de/uploads/files/mebat.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/wowivutoxibavedobumax.pdfIn PDF document text
    • http://telektrans.hu/editor_up/vevipadukixovokum.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/56876192681.pdfIn PDF document text
    • https://vleek.com/uploads/files/gunizezadilidiwat.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/fodifedikufetitijasegato.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ba0b3e93---belizobidosari.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/17247052566.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353b6b1637d---lilowufededo.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/xoruniduwokinolanep.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613767598b00b---nafozigumad.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/zinifanomerapelolulo.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/duwosemekevaboxij.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/geken.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/gabawe.pdfIn PDF document text
    • http://dmkert.hu/files/file/felinijoruzikediv.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/kinajikefanekizekegovoj.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/8182499047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=iot+android+app+developmentPDF 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_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 10400 bytes
SHA-256: f788b8861b98bb2eed874c81b13bcd63b67d68900a154daada62edceac483c3a
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 18544 bytes
SHA-256: e9356e996cfac7734281bf27fd9e38e3bded70a93fdc747e522dd1e321b7501b
font_02_sfnt_off00012da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1