Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f28ccee8491d513…

MALICIOUS

PDF

90.0 KB Created: 2021-09-05 23:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 58f399271c0f64b80baf00837970b5a9 SHA-1: 1339b5046eb5db3f1791a06de62ebdacbfe167b8 SHA-256: 1f28ccee8491d51382baa2922c5c15b686b11599b72eb5582cffc1236038e689
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/kezefikezizegedobovemekew.pdf In PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f22d51a927c3c13da199217fa445259d/kipezegifasugizaguvotof.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a940172ddab---11261798353.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/nabozunaloxerite.pdfIn PDF document text
    • http://teraval.cz/res/file/24517678629.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/11b43c04c7c3a8ff4b1ed86dbdccbb0b/83249355173.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/fajemoge.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gatuvoforololatujewume.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/40632424641.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1af9e94b62---rijaxitusowub.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c683c0a1---rabibuk.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/65760384447.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a3190c08---mirikuterinurefifeso.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/sorodogijegiwuju.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/nanezetofamijepininotizag.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/6220773410.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/86264482135.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/rodagoxuzutilukukox.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/44suv3pipnu8bttpd5ccjc3pq7/69019164356.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/64125090988.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbbd85761a---56443651726.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/4325315926129f88253034.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/52432878970.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16095c45fe7e99---gewewofo.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/83058420798.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/15307144278.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/90029171401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=memoirs+of+a+geisha+novel+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013c4d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C4D 18544 bytes
SHA-256: 74a40e6fbaa5730bb0e82dae7f7319d308d6c03a6c0bff27ec3fce0ac6f70b60
font_00_sfnt_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 10908 bytes
SHA-256: 31d660d1452e4385f93f3be02d3f14c8591b2cd81f49f09e5659d033df75ec58
font_01_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 17236 bytes
SHA-256: 6a76fd9534307a428b26768064fdbb016f26ed933a0b689d529b098170194220
font_02_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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