PDF malware analysis — malicious · bc397389f44cc7b9

MALICIOUS

PDF

87.3 KB Created: 2021-07-26 14:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: a559aa484391dc67fc3e552cf869551b SHA-1: a2c409510f64ba3dc66b1ecbc85613a582be589c SHA-256: bc397389f44cc7b96f8853ce6142802bd7b951ebf98956e20e381bd300025967

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to compromised CMS uploads and disposable hosting domains. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9896

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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799625d64a6---56375286290.pdf In PDF document text
- http://pivotal-technologies.com/userfiles/file/71428196435.pdfIn PDF document text
- https://emprenderem.cl/files/7452239357.pdfIn PDF document text
- https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fcf0e55065e---28287218072.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/bd6bcb34693d6d0b23ccacfcea193954/femeponama.pdfIn PDF document text
- https://stollerco.com/testingsites/advantage_aviation/assets/media/file/nopedadofap.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7040c882cda8884381b9672da6ee460f/pikeja.pdfIn PDF document text
- https://willmarareachamber.com/ckfinder/userfiles/files/jepavejebovadepumox.pdfIn PDF document text
- https://vietnaminsight.biz/ckfinder/userfiles/files/porikor.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505150841554442.pdfIn PDF document text
- https://gachbinhduong.com/upload/file/44160926136.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/34b0f6be64fdd685312a373d665f5375/14256796952.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c56cdedb210---butomonisej.pdfIn PDF document text
- https://lesura.net/userfiles/file/xeterizakemef.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5599561b3---49172557543.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160aca5a5e736a---jojafevezifasovivevabixu.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/23f09e25f84b21e50cc260d14e79504c/lizisojidotedefixufo.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/37d54eaf8db5d75aa66eb20c8c98e8dd/xudesapik.pdfIn PDF document text
- https://rt-totaalafbouw.nl/userfiles/file/10135176278.pdfIn PDF document text
- https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/56bce4be2e7fd3bd0c3a73489f05354c/nuxiwagadas.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607056d737735---85667427462.pdfIn PDF document text
- http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607955d8a53f9---nodufaniwat.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hm463u82f9r0efkla1jn97b3r8/suxekijokewosavafova.pdfIn PDF document text
- http://enotecagaribaldi.it/userfiles/files/64450986696.pdfIn PDF document text
- https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1c62839730fbe0fbed32c1ff0fdadebc/jijomanapezibiwonedajinof.pdfIn PDF document text
- http://cephedanismani.com/images/pages/file/salisuzifonuxukepax.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=twilight+saga+new+moon+hindi+dubbed+download+720pPDF link annotation
- https://mediaget.com/userfiles/files/49321690688.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA7B	18208 bytes
SHA-256: `ab7dd82582420019544d60380d78fb488c23c5d08ae2679d4ccd2f01cc30998a`
`font_01_sfnt_off00011991.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11991	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000131a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x131A8	11320 bytes
SHA-256: `dc650d2a6ccc948d822b0a6e6b89794463fa0985aed9e8856db4239ca22486c3`

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