Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f690f2b7c7f84d2…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 22:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 51c3801041668ae071860e9a3f90e1b9 SHA-1: 48dfbc12a4d0a6fbc24f41d4421a81eb44765693 SHA-256: 6f690f2b7c7f84d270006c8bda51e7f16721fdde91147e014003e019f96566bc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://bizbecho.com/pa/trainstation/uploads/image/file/vigowomol.pdf In PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160793518b04ef---zukepetokok.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c4d34f4c9---94499774534.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/5247568719.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/pekasilila.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fqmdklb6imk22sisdbh9fl5k2/14666665650.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607611ff97d7c---79769063320.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cbb3e1a05---xesidulabokugedar.pdfIn PDF document text
    • http://usa-ex.com/images/blog//file/xotedibebejaxa.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/derizogonapagijetutatubub.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/85716229157.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0540a533b6---77309408616.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/76604335421.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/fuzonugiso.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8548b83e---tedajesigupavelu.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/41703251001.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/15146537110.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/0f3e2f1ca958b0fcbdc6b8bd3fb42295/38691521304.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/aaqjks2hue4gjrdtpjct2qpqoc/pizuzimu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/5c1f9a9d8e567d24435f011b383674a2/60321640760.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fe999176ccc19c270924e88c6651305c/83677875579.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/500ba7e991f04542415692fd9d1b7487/zujudugiketuzodizonuv.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6618eabb25b9cfc1e4f9e2098c32d438/69735012307.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///33509730261.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/44916742128.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/31e5d388f7efc3c9d6edbd83b76c937f/jaxosunepakosepajegimen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=urbaniza%C3%A7%C3%A3o+e+desastres+naturais+pdfPDF 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_off0000cb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2B 19988 bytes
SHA-256: 58bcf5d794c6f01360c26d392165b8699e7bb110730aa01cbd148861f0cbe2b4
font_01_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 11216 bytes
SHA-256: c8241fdafb60fb1760fdb7c4a77d408072ef94299688113442dd475e237fabb7
font_02_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1