Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6851bf9c6872a6…

MALICIOUS

PDF

96.2 KB Created: 2021-06-28 19:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 772700d8ce8ee15e757daf70ad0ac0de SHA-1: 2d51984eff794a503a7009d570859665f9382fb8 SHA-256: ab6851bf9c6872a6ba78e00117223e968861a1c4b76290f1722c9674ff56feb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous suspicious URLs points to a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/a3mpftvkuuq2qluvb52n8lug7b/32479152631.pdf In PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5eb387d40---vulofedu.pdfIn PDF document text
    • http://juentai.com/userfiles/files/80488118638.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h5ul50c7otttrik47c3mqcaj64/36365292832.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/nuxerekuvijoseji.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/duzefedal.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/sopivukexazojaxin.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086d59fd0b21---40290858918.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/56269741118.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/49355174839.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070e238891a3---64981289140.pdfIn PDF document text
    • http://gpn1971.org/clients/a/a2/a25689677492d603657f1241a2a69ea8/File/69603825793.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ad3228bd5b6435b359c3d1ccccc176e9/43763980122.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b304705da53---rewexipajajakupele.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/bofabubunije.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/tomofi.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d073079d4---69297128905.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/6812668735.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a7cb7686---43993102209.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/nedujenev.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/valifafanetisix.pdfIn PDF document text
    • http://snsi.jp/image/news_file/ronesimo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb97b3f612---4285293204.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91f596ab1---15566542707.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d986ba8490---dozusiwude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+do+i+get+to+celadon+city+in+pokemon+fire+redPDF 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_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 26880 bytes
SHA-256: ee626dda37f6a2e895b5681ec354f436b9dfbb383f001ae7d460f42a36d5b37f
font_01_sfnt_off0001416e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416E 11080 bytes
SHA-256: 463a7b6259fa014f4a91516518e6ec25db1254323d74487f6dc36f163f88eb06
font_02_sfnt_off00015b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1