Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa0bdfcde5c4c0f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 06:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd216db083facee84276b47765e3a8f1 SHA-1: ff89db69108f098aa826ebe278fb39f19fe97e95 SHA-256: dfa0bdfcde5c4c0ff4a47182baae9415a4fb7f06df5b5ea11554e6f2322b7bff
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, some of which are identified as potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests an attempt to obscure the final destination by using multiple layers of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nikolalepojevic5.com/multimedia/file/gawejoreduzewaxu.pdf In PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/libedasorutojukaje.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/kewelonuwolibibuwasa.pdfIn PDF document text
    • http://4bx.pl/public/file/jipurodisazotasa.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2a927083f97f3e9c8a4ceaac863931c8/lowijekopugetiwiz.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210909_9599CDA919EE1B50.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/54270771102.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/98511556809.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/migitelotakix.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/35942672806.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/xelex.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/bitivubeburiwof.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/50585559386.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/45678761453.pdfIn PDF document text
    • https://securitydm.com/slicice/file/zusikisuseminege.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/10368788165.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385c33c48f6---4414454639.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/98399192962.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/5126556024.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/bojunabawidegig.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/wetawokaviz.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/22364911344.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec43a1d32c---xasatufis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=heart+of+vegas+unlimited+coinsPDF 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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 10976 bytes
SHA-256: 0e892a23ffce197a58091947e90d32989254497ed28870fb430cce3e906683cb
font_01_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 18432 bytes
SHA-256: b74c03fe9e7a027215777f50966725d7b917ae3393f712e6316e0b7eb099a3df
font_02_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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