Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33fae9d50d3253d…

MALICIOUS

PDF

83.2 KB Created: 2021-06-30 21:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 73df1473cdbda5cc4809b3428bf1d680 SHA-1: e5845eaeb6ad2f057a1287b6e221c13402abeca9 SHA-256: a33fae9d50d3253d62fe418addf5a76d64829f70447d036667787073cdd391d4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm for phishing or malware distribution. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content is designed to trick users into revealing recovery secrets or private keys. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure strongly suggest a phishing attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://synerhu.ru/uplcv?utm_term=cant+open+pdf+android PDF link annotation
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/qr1ueqhcg0q7b4921tgbekh83q/sevosiwojawekupujebulav.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jezululijagovosimufolef.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/zokibi.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089342c6c637---22366315218.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bpe5ang2egguoj8vs6jt0ov372/voduxokuzunoguxute.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/77451b315c7c8b8dfba0ff7ff69e5689/dogunuxutekapa.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46cb6dd89---dutazokajaditobelaliwazaj.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/13587534417.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ivgt6oic0h51vihc0875ol1to3/99076007116.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c0cc33b151ba44b1b6acdfb249c3073d/divibusot.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c25317bcdf2---10078558717.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1e656c4b---jugejokikukomug.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7cbedb244766bc47cdb9a9636c24fc42/10739928432.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/ae7bccf19fdeed751f55fba7b3e9069d/gipevematujudevasadikub.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/fezofetikedinedaxasefezu.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/79044068631.pdfIn PDF document text
    • http://pinxedien.net/upload/files/jimevowu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/9i5h1q2on4dar5e86e4bn1jacm/52928558601.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/34227257315.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890ba6d9746---56794256978.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/migavexo.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210623190826.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/f4d91b16571838ab746c5441b6fbfcf3/59969640543.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/pujekovobid.pdfIn PDF document text
    • 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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 10308 bytes
SHA-256: bcc74655e7e4987c582932707260c65c0e91adf1fa580343a93eed7316fdba35
font_01_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 16864 bytes
SHA-256: 78ccda05d9235a549a39078b65e06845153e5bc9867ec3dab56cc563c30f1ef2
font_02_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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