Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3cafc1ff1727cf…

MALICIOUS

PDF

73.8 KB Created: 2021-09-09 03:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a83723b51e9b6e73a7d14799ca0fdf3c SHA-1: 17bcc64974a1618d6aaae7c9afd653bc97c04008 SHA-256: 6c3cafc1ff1727cf01b4b12d81577279ed9679f62fb669896108296fe2d231f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic firings indicate that the PDF acts as a link farm, directing users to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://czyxchem.com/upload/files/sekidepegal.pdf In PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/86dd3eaf0bf4ede3f1c746b68fc45584/lakawifuworezisoka.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/lisinutobekitidekutarigi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133df8b3ce67---vetirabubafukobavu.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/63085942457.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/jelixadokopawesovi.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/kizubopub.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/37073560.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/97108648812.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/gazomijipag.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/cbdd7b4222fd262fbf3ec99a27a5013a/65739416560.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16138c64fa8b09---mafemorema.pdfIn PDF document text
    • http://logicamail.it/draft/media/65629902535.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/givejubozaxip.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/dakapojumulovon.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/pokajamedafitemibi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137197d4a6c5---filuwaxeferele.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/maperulupipezigizaxir.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/kafezaz.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/72948605098.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/lujow.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/pefenuwufa.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/90974918221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+power+of+myth+joseph+campbell+pdf+free+downloadPDF 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_off0000bd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD59 11224 bytes
SHA-256: 8c4bf1392a077d5ecea96933433aaa5103253276687788df7235706e213ec85a
font_01_sfnt_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 16336 bytes
SHA-256: 03c13378279e661789fff83573b53385f4647d21b4ac48a4c67ed345b545a762
font_02_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1