Malicious PDF — malware analysis report

Static analysis result for SHA-256 82068e78fe7069a0…

MALICIOUS

PDF

91.7 KB Created: 2021-09-04 03:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f71a367816af604c8aa01c93fde8399 SHA-1: 47cad885c6fa7066b34d0a49d42cc25050e94a21 SHA-256: 82068e78fe7069a05a13681bb95c2f8a14991ff35f1285c1d9a55bc77f6216d3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple suspicious URLs points to an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://intrigantka.ru/images/userfiles/file/88342834725.pdf In PDF document text
    • https://chief-moving.com/editor_upload/file/fuzulupuje.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608831fc2a1ee---94391028119.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-26/20210726112510909685.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/secjauk1aiur2obti63b4gqu1n/93230124169.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161007f1215ba1---tubudemukudi.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///fojezinufedurekoveboxugax.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/88325068378.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210821222602_228036.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/93336734009.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/42936348336.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3767b946da85679018ed6c5f64ecc6ff/sevopag.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/bupizewuwuzarerif.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/49259822317.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/5408148555.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098779b81618---65359789425.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/13884020620.pdfIn PDF document text
    • https://stopserv.ru/files/file/87004281312.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d2fc316c7885a5185356fa19a227b4e4/togotuvini.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e412b540b---dovixiven.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830b429595b---koruduwuzimegobi.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/tikorodoritaxifim.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/65263616384.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109030459006849.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/58868451127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=nelson+grade+7+math+workbook+pdfPDF 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_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 18596 bytes
SHA-256: 1e041c3590b51f6e4fcde5ceae5f2db44975aa88105ce4b1ecb27a1548068744
font_01_sfnt_off00012f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F14 11196 bytes
SHA-256: d90d45f3ec9aab078098a07de1cb8ac6fd9ce85d71da4d8c1d2211d79975e953
font_02_sfnt_off000148d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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