Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f580e36a0a15e32…

MALICIOUS

PDF

85.5 KB Created: 2021-07-06 12:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4967dc16f6e4844efb2e3e291a9dcb16 SHA-1: af30093457c8c8d64f0ff0502e13b66d0392ef3f SHA-256: 1f580e36a0a15e320a7b11976726bbf5c9f1bd44068d9e12810f278a4659adc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple external URIs and link farms hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The embedded URLs suggest the document is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=weight+chart+by+age+and+height+female
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/bed4de9108e0948ae2c37ba76b423541/62108127558.pdf
    • https://infoenergie-loire.org/userfiles/file/tepakup.pdf
    • https://turbooto.vn/upload/files/desexijofamuxuvaforiv.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089f95c8c9b3---pufamomalatexejufedirufix.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16078f89362cd9---49547983413.pdf
    • https://solo-enoant.com/content/files/files/salatebiriwatazoz.pdf
    • https://lapalettedesarts.fr/gestion/file/tibudixiledud.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/577ba22de6e5947769a6068f5f5ffdeb/mavuluxisudolevitajejilos.pdf
    • http://feach.ie/images/uploads/file/50213101311.pdf
    • http://sobsai.com/ckfinder/userfiles/files/tosofe.pdf
    • https://cleaner.pl/userfiles/file/8725750207.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895c2f4e5b5---warela.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/34067848134.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0285852aa---gekopulasidub.pdf
    • http://coffee33.ru/archive/file/zilegoreto.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607632d7255df---raxipezofilul.pdf
    • http://temple.mo/userfiles/file/20206715908.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adfb21c956---fufavumebaxuju.pdf
    • http://www.medicellbank.com/userfiles/files/fosakokodiwuni.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c623dc234f99b22d75c3da40ed6e2487/libozofaligopibulimifu.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/902f7dd099301e3029b283c89b8e790e/timokirum.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/95okuh1m2a0881n4je4dmntb31/83039181146.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c1329aaf8076928e9e7c202fe10e03e9/20972035058.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/23633638461.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bc96180bcc0---kokejufi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 16792 bytes
font_01_sfnt_off00010381.bin
5389191533c6c5f5246b5376322f25e87405958296470d09820f6c066017905b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 16944 bytes
font_02_sfnt_off00012fb8.bin
64efdd1d258ae7c772f94995e81b8020c3b404d4f555eadec6ee90ba876f983c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB8 10884 bytes