Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a20df3a3309a10…

MALICIOUS

PDF

87.6 KB Created: 2021-07-17 01:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f4aa812c70ba17ae5fe9a5bdd95a454c SHA-1: 11bf0ed84952878969f7bf42cb39a682a5008171 SHA-256: c3a20df3a3309a1071f7cb739ae85b17b5abacd72ad9472868b84971d6c912ca
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hoshitorionline.com/uploads/files/2434002265.pdf In PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/83497729746.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/41247384380.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/f2qba59g4ip3q0q8flgjfh4h3b/72823206701.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/cfdb967faf001aa42bb960f1d949d0d8/25487518961.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/e1o5tagn5ilh320qvsi377re80/waxejifusumetepodazuzowoz.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/wivefelojiwefuwura.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe00eaf8e---59751051013.pdfIn PDF document text
    • http://fotossc.pl/_files/file/tukarawipova.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/92464068800.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6cac5c8fe607b37c74df823da01287ae/54655019464.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/f4cf7540db1d3194f69a0e7bad823ffe/97907585687.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9ba17ab20---64021315097.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/70210590151.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/vavoj.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e045d79435---61884709751.pdfIn PDF document text
    • https://digireg.se/upload/tupowumuputifim.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce95461e92---71644287704.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f87c08bd4---tiwavixetajumabutekizu.pdfIn PDF document text
    • http://e-sportis.com/images/upload/59361053307.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1626421075.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/vifuvopepifalodujare.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5e9865b2de17b61cea4881cc6f88a3e0/resonesurapejafo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/35b64d128ad6b106eb7c3fd4112db715/82801423877.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/98393273669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=animation+gui+robloxPDF 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_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 10472 bytes
SHA-256: 11059c0c16bd139f63d47f57ae6bddcd57e9f3aa07f4de7f8d69aa8aa8b7d5fe
font_02_sfnt_off0001235e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235E 17620 bytes
SHA-256: f42c3a0cf18d48d89ae2e5bb20b3aa030fbd2d5b06e243ca9b743ad15d866078