Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06bafa730d3d466…

MALICIOUS

PDF

88.2 KB Created: 2021-07-03 08:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 09fc6a80943c04ab74aa32db55ff4850 SHA-1: dd3080e4200c388e033d1597376f181f4c5a6f9a SHA-256: f06bafa730d3d466cb864933d423ed6ef896247e16964def2893901552c678ca
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV both flagged this file as malicious, specifically as a phishing or trojan threat. The link farm structure suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://fokusmedia.com/images/uploads/zilomovuxawivagijasozitun.pdf In PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/72t941q1pqkd5674j6r6bk8fg1/sikaviju.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf5ec2907---52455127502.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d583e2286904b1f5be3341bce261fa11/vizubowetupawavokivizobi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e291319f1---biredajozanasimuk.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/72578320317.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/1627586141.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/c3tqnqgah4u0o3nciqefio57lp/54043628461.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ufedeaufehuk1ln6hii9kcjq1/fidowovomuziwipevan.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/5582577154.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ec4f579c67fbac17a24cd708160cfd14/gijorowum.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/lafimujakila.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/38138242936.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8bfc21748---96080720482.pdfIn PDF document text
    • http://accronline.com/userfiles/file/taravobudogob.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/l9al01vi2r4jpvdrcq27ttdomp/31966221729.pdfIn PDF document text
    • http://fotossc.pl/_files/file/sazalerijusutuv.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f59aeaf275---42104412039.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/795490955a9bc04cd3e3e79f38cfa005/25136050255.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a46430d80a0---miguvitixerevob.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/wujupaxavubadewuwate.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/fbbdf9b584a769ecea73fcdb28de8206/kuvabiserukanugigafalifu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8b2fb314f6b7395b04a76641ba374fe6/66522371363.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f626eced7---goketeve.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/16c352827718d3eb957ff8264d0db30c/98308409398.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210621055314_3oc36o.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab05d6c89---73001363186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+most+common+verbs+in+englishPDF 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_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDF 10684 bytes
SHA-256: 3ab027d84ed20267c6a6583b6d77257d9242a8a718b815327e6b0abaea749d32
font_02_sfnt_off00012433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12433 17908 bytes
SHA-256: 8bbbf01b4ed5437b937f214d533cd39486dff4fcce0ae97dfc22d81592deb926