PDF malware analysis — malicious · acca66628b8a22bf

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 22:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 0cb67dbf7bcbd670a3b797ffd4c4afdc SHA-1: f310e50896d4fa3ee73e702a10312b0caeec2c2d SHA-256: acca66628b8a22bf6aab6c80d06d96955e6ea28b70b526a3fa39f61a9029b988

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to phishing sites or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=roman+numbers+101+to+500 PDF link annotation
- http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/nabozibejupitib.pdfIn PDF document text
- https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e93d716d3b42d24a7f3f6b7abcc94d67/lifigekoraku.pdfIn PDF document text
- http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec3675b4ed---52716246704.pdfIn PDF document text
- http://patanamachine.com/imgUpload/files/mewuruzelifa.pdfIn PDF document text
- https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/pumopep.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0643bf20b---80201272697.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ccb6a7a08e---tororazixadimawasukegij.pdfIn PDF document text
- http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kupikutafonuwinivuselel.pdfIn PDF document text
- http://www.insight-assessment.com/ckfinder/userfiles/files/zebapidasuvabamelas.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a6b22983---45292644558.pdfIn PDF document text
- https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/gr5dos8gj5l8dgig8t8evb4513/18864917501.pdfIn PDF document text
- https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80f80df91---jejetikerulob.pdfIn PDF document text
- https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/96423b08b747d3f74fc2f66e610db648/wajifo.pdfIn PDF document text
- https://perfecthospitals.org/FCKeditor/file/jisavovo.pdfIn PDF document text
- http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a038ad145ea---38353410209.pdfIn PDF document text
- http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f42c8db9a3ec25c8e5509a639b9730f8/vapexirexexuka.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098dad6da61a---90812635421.pdfIn PDF document text
- https://aihr-iadh.org/uploads/FCK_files/file/zejujuvekorofiwabiwela.pdfIn PDF document text
- http://dermatologomiguelgallego.com/miguel/fck/file/bofatiwiwimavuleze.pdfIn PDF document text
- http://halmar.info/userfiles/file/gavezo.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bd73c98a0693d2eba0a50fac8bdee3cb/fugateronojumodebipaw.pdfIn PDF document text
- https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/119652c5f7a32ad661ede4073bf92b38/tabije.pdfIn PDF document text
- https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6138b2d76c59fa8cca28cfd1319424f/kipamer.pdfIn PDF document text
- https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/su4q25r9kg2n0chof66v0okn0d/72364831801.pdfIn PDF document text
- https://honkakuji.jp/honkakuji/images/ckfinder/files/tupomisodaxajosaxijofa.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_off0000dfee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFEE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f800.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF800	15356 bytes
SHA-256: `206943d182d72b8981d8bf3a9631aa991058980c314188c9e2793de9295bb7d3`
`font_02_sfnt_off00011e99.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E99	10724 bytes
SHA-256: `0641513a26d1121fca213e7ae439d9e25147c0cbeee408f375cbf62cd0bbf9e5`

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