Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbb664ed89b4929…

MALICIOUS

PDF

87.4 KB Created: 2021-09-07 15:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73b7db0279f9d8289cbc1180a5b10308 SHA-1: 1efc30d1be496e1622fa22296d7d294d12a23b3e SHA-256: bfbb664ed89b49299148900307880822f9ec87dc4225360abf47cf2bd4c0360e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d029ad4b20c---29845132235.pdf In PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160896ca683c26---4173839534.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/gizebufuxapekanid.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/tukiwavejidovedemazijadi.pdfIn PDF document text
    • https://hiroyoung.com/data/files/89064089211.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/tepome.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/e088894981305d9dcd230c7575de5fd8/puvagixodulanira.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde3413cada---wuxixudanurovixiwavanuruz.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/60016937016.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/193cdf592bd717eb016c1c8962408cbc/wawerutitipojawufevopi.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210802_112510.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/soworafavewevulidulerime.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/95943028656.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a494af92919---dujimomojexenipadokutit.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/670c3842e3b5af2da0939b400bbbfa91/75350727950.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/81764829682.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/fozumumefifotepulilexame.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/eb79a1b16650243caa7ec028a15bc748/35197794451.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f3fbb45792891649a6eb30ca61b936b5/rewatabow.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/37350888085.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/fc878fd185fbb1052b0311aa980287f9/22718720460.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/dobonogidenuz.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e72165b96d---bonakidiwegipufog.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/66341111148.pdfIn PDF document text
    • https://uangraja.com/contents//files/doxozug.pdfIn PDF document text
    • http://dakmet.pl/upload/rabizepizezegejobogusade.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/bekawuponavovalofabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=eritroblastosis+fetalis+adalah+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 10616 bytes
SHA-256: 036c370c55927d93ffb65e6df88016606e80a52306d53900eb5520f3f004d54a
font_02_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 17668 bytes
SHA-256: fd5f54be276b8f500dda758e1c8b4505dd968225d153737fd5bd41f127abfc3f

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