Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde0a26003ee7cb2…

MALICIOUS

PDF

73.6 KB Created: 2021-09-28 02:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e910a2f94145a176cb7a21d8492b7db6 SHA-1: ecf4ff7fabd41321bf4cd55f120b6135182e79e5 SHA-256: bde0a26003ee7cb2d8df426789a1003593f8aaccf3a8cac109783f380b112a14
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ismet.com.br/ckfinder/userfiles/files/ralabelegasin.pdf In PDF document text
    • http://aczelzalog.hu/tmp/jixerifa.pdfIn PDF document text
    • http://halmar.info/userfiles/file/sudovid.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/93962474046.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/jawutaxubofol.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2b69d1a6a024604f55e6eac12b0bef00/12256924046.pdfIn PDF document text
    • http://wmsone.com/eimages/file/46370953047.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161523d373cdb5---5432079679.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/25075185001.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613316f34b244---53160402697.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/92396677288.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161503c2586cd7---20209751762.pdfIn PDF document text
    • https://negaratoto.com/contents/files/28679764119.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/putis.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/16535309599.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/lawipinu.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/23710002031.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/88278917649.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/28463876952.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-14/20210914182450901685.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/87654842732.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152426f68d4c---bikowef.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/sovalenidiji.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/36476429204.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/rojalegijizelekowolugafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=formula+of+finding+perimeter+of+semicirclePDF 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_off0000b67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67D 11040 bytes
SHA-256: e64055cbe46128b3e430d015a32de4f3d3d4ba1a479936dd4605c23b51ecfa5f
font_01_sfnt_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 19072 bytes
SHA-256: 691e8a07f0b28ce3de8860599dc6db33529bab6ffab6382178075919f7ee13f8
font_02_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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