Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85fc2480785c250…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 21:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 99260ab66a7549be4128b197c630f5a3 SHA-1: 12b27df2d4c39d9dcb179835465488d5693902a6 SHA-256: e85fc2480785c25075b5a7e244d872b4d92c0c868ee95f9d24617edc94dedfd8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' button heuristic further supports the lure aspect of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fasson.vip/images/editor/files/93153221157.pdf In PDF document text
    • http://wsp.pl/userfiles/file/92918950494.pdfIn PDF document text
    • http://trivio.it/userfiles/files/36255769281.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/mibadekerutefujidomoniw.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343f815fc1a---sujozinod.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/58307850379.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/31302342419.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/78648827767.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/14687476825.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/suzirapejapejilasano.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e25aa7b60---48743103179.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161427f840d5b3---wepejagilepowadigosizid.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/voket.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/41277656750.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/jasibugonigepidovunoseb.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/kiritepovakorabarifew.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/sezigafusated.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/60031650446.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/17373066565.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/4709757454.pdfIn PDF document text
    • http://njchemland.com/upload/files/51588400111.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/65054195601.pdfIn PDF document text
    • http://canoeing.by/pics/files/lovetoxavimibinapobotul.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/56130453385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=aayirathil+oruvan+movie+free+download+high+qualityPDF 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_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 11124 bytes
SHA-256: 49608af517033142a4eda3e73f432687991e53d4b95a895f6c12e648de68d7e5
font_01_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11956 17256 bytes
SHA-256: 7edd18aa589f8170a6ea05d14e687ad2088b9f3162f833e817deb5c0bce6cb22