Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba42c2630cd88fe…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 11:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9ee5fa68bcbf8006fbefb672a3a1e25 SHA-1: 3837e30cfc183b9bec7337467128b450356a14bb SHA-256: dba42c2630cd88fec0d28e2c9028f49e1f6c3c20b4368a8150e8451b1bcd040b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to redirect users to potentially malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=promo+code+generator+for+roblox PDF link annotation
    • https://ww150003.linebot.net/upfile/files/20210920005404.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/ginulavuzubevamo.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0541a3c3a---93153010260.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16147e5d09ed42---79024788262.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/13727587417.pdfIn PDF document text
    • http://jawarakreasi.com/file/dobodarosuwutusibeze.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/81306181983.pdfIn PDF document text
    • http://goldmustang.com/files/files/pikedakubeto.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/88595185714.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/52777668864.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/5515681742.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/8649805328.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/81415008779.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/soziwumawubuzunuleduk.pdfIn PDF document text
    • http://vititanon.com/user_img/files/gukedetito.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/69294193145.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/32790693145.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/46362157051.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/zisefumunufusesowekewivog.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1632611075.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146347f3dc14---61780175317.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/vosedu.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/71592737690.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kexuzadaj.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/povekadakukire.pdfIn PDF document text
    • 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_off0000b266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB266 10800 bytes
SHA-256: 72826349c3e561e98dd467ef44e968830683836d869ab1f1f4fd73b3c788f6fe
font_01_sfnt_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 17168 bytes
SHA-256: c8176233dd1abf47fcf507dddcea53d0852650e56ca5d36566e830c1d7f008b9

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