Malicious PDF — malware analysis report

Static analysis result for SHA-256 a249213ff3b80681…

MALICIOUS

PDF

92.0 KB Created: 2021-07-15 16:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2dd86abf7eff2f8891736d7d97ef36f SHA-1: b4a022828f61a4ad8fb73896796ac241280e0f9a SHA-256: a249213ff3b80681b362329f71605e99ddd36aa6c3f9fe2d1cc219d1ef07a6b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=cooperative+learning+math+lesson+plans PDF link annotation
    • http://kamerton.nl/clientfiles/zusoxanajower.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d079d162bd---13155550683.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b225afee2---16309494324.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/redosidubewewizemewe.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16091829a5e70a---zenininutitimojawaz.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7a095220---22050141026.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160adf4fb6e9f1---poxuzobijoximaniwawul.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160abd770b7bb5---92773070263.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/23851208345.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa247eec01---baseruro.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921a549112e---bonapatub.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/mumuvejunu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9dec72b34---xuruvazonebatowititet.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866957f36a7---1300190635.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/82697458719.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/q97o02026atiqrdhnh0n71veoh/8134925540.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/74215783290.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3e01e0f1b9e80572ad2909d7c5042c06/58227298532.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c8d6fab7456c5031eae1d38cfbab3d96/mobuvafipeledigo.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/14055718517.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/zawiwowovonuwiz.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/51796819b2fea5f71da4e94bdd9bf7ce/mifalupabemujotazuka.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2b12ab88a---sasavivezoxilenibelud.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b077c6068b4---52136584839.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_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 10796 bytes
SHA-256: e02ce59852953db4e2bc1153ba7efd96dd3933019885c1b6bfb950a81c4d5ccf
font_02_sfnt_off00013434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13434 17024 bytes
SHA-256: 6ff952149d3547dadf26374b16fc92fa97d1d7e99353819597725a6f2606e440

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