Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fe7738091b9ddf…

MALICIOUS

PDF

74.9 KB Created: 2021-09-14 12:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2cfb182ace1f61cd5309e18333b2923 SHA-1: 0ca2876f1ccf125f738ec39c92d2f27aa3536847 SHA-256: 54fe7738091b9ddf5095a519bb0caefe3d8847148601268ad88a5f464e7a3b57
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards a tactic of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=download+manager+apk+pro PDF link annotation
    • http://abwhopewell.com/uploads/files/87972752433.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2eda477b2---lonoseboxa.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/xomidajukoxum.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/90272475842.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/71901503550.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/jejojadikefisipe.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/tomarabobemeselavewapel.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/digufo.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/89029379698.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/70688262124.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/pogamowagusipu.pdfIn PDF document text
    • http://jinyezi.cn/upload/muluvunipuxavamuki.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/67307402020.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/97664914816.pdfIn PDF document text
    • https://ahha.az/userfiles/file/tedavikunagepapunux.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/madifanuzedari.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/e8d6e18ba346ea55474cd4a91ceeec95/sifodesupaviguzal.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/73799880920.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/bvmt14ir8iephtt34ll04ikp50/getukadogonulaw.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/98879964354.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/60110485466.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/5751099636.pdfIn PDF document text
    • http://terminsk.by/pics/files/pufudufavigib.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_off0000c1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BF 17068 bytes
SHA-256: 1d5b8152f24134dcfd7a7374dc1944a4791a5d458ae418c067f74aa907000a93
font_01_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 10556 bytes
SHA-256: 98c2278147074b60bf70ede96da335a94bceff882660cc3119e58ffa2f379865
font_02_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1