Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d36b07f4a12be34…

MALICIOUS

PDF

74.3 KB Created: 2021-07-20 15:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a66ff5913ab1ec63636a7fa5c645db5 SHA-1: f1bc14744e13c96bbf477bfdadcca7d8c5cf6e5a SHA-256: 5d36b07f4a12be346e390b598a2a7f3596480e3f81fc1260d39d46c377b1578b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests this is a tactic to obscure the true destination and leverage potentially untrusted hosting.

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 http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/5l8k396775vngf7etp37e7k7g5/bunuboxusatux.pdf In PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb7abe6e3---13974303951.pdfIn PDF document text
    • http://sport-way.ru/img/file/rumilijo.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/pafazex.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/0qrkakstsq94uiucct21vmjlq2/67733069779.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ad9368b12318babb3de533f0f8d080ad/jefejavuwepud.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/624414d63c812b805b01795ea6d40211/68716962493.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/41862925758.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/20203369045.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/xiruf.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/zejotubajonunasikakuze.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/82933174434.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/tibofiguwumenepuwaxilit.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/nr9v1p98fh627eem3ago3p5ho7/73041093135.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/bazixivod.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/zilixoledinezuwumasuxubir.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/17055471161.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f903684417a03ec5a07bca7e9088ad47/sesokixotibad.pdfIn PDF document text
    • http://zuche0551.com/upload/file/27643869836.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea030107d---vekozetenitexitokan.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ca0c3ac84f32f2f965bc6fe120d70c1e/birifimabajafa.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f31920088fba22d2ddcc99865ac7d569/9640395225.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4noler6203hdp26vdqninjdita/nesifaluwiwij.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cff7d4c2f---wakunafomidek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=the+mamas+%26+the+papas+i+saw+her+again+last+nightPDF 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_off0000c203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC203 16744 bytes
SHA-256: 3b4fd45da7df34c02b166fa6e4a578e9302f9a9c6e3fdfa8479fd779343b9267
font_01_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 9776 bytes
SHA-256: b33723d9cd56bbbbc40740f41757a9811ce683344a588262d5b062ec4c9b0ae1
font_02_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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