Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6cb123a83bb3d97…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 13:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b5377dc8eb68c8b47c36440333979599 SHA-1: 6ba5a76a5053372dfe8ca770b9d1949e01e0103a SHA-256: e6cb123a83bb3d974025efabc1ae0e48949e319b0dc180bc397b86ac108d8f1f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9f41bfebf5533cc83b928cdf187821d5/gemofudapegijagizisa.pdf In PDF document text
    • https://pearproperties.in/userfiles/file/wexepijakumosuraxila.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/36309329369.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/65985790111.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/japubilura.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/8271766610.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/rujojuvuru.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/tuzajubupojope.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/32876047310.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210922_230706.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/40426192416.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc1d920027---58773149649.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/xojavizir.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/ruxixabipisilafil.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/91942258622.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/29322525734.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/78451326157.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/45897052387.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/32980954427.pdfIn PDF document text
    • http://upakuika.com/img/file/15676633377.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/kogunefitegalibasexosuvab.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sooe8lur6pihi42adl6b9rk5ts/78178556448.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/95537149492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=home+design+house+decor+makeover+mod+apkPDF 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_off0000b0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DB 11064 bytes
SHA-256: cd27bca13ce7306eeacd20064717e95205ca77c45ffa2b6b2e795ddba4c97901
font_01_sfnt_off0000ca2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2C 15652 bytes
SHA-256: 22bad85356406c631f59a32105d9d9e13271de6149b547e0d61a6aee9950ab6a
font_02_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1