PDF malware analysis — malicious · 7cef77a0fb5765d5

MALICIOUS

PDF

90.3 KB Created: 2021-08-12 20:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: c6488b81eab7f5023990861536071ebd SHA-1: 70d08753bae3ca02a43d152e168df506b4023247 SHA-256: 7cef77a0fb5765d5de1a6fee52780897851806d3eb2a503d78f81ed870789f92

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. This suggests an intent to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=why+is+it+important+to+use+a+structured+cabling+standard PDF link annotation
- http://www.logomarcanet.com/userfiles/file/91177776051.pdfIn PDF document text
- https://cplastik.cz/data/cms/file/nilusidifu.pdfIn PDF document text
- https://aimhc.com/userfiles/file/15292655192.pdfIn PDF document text
- http://benedictinoselrosal.org/ckfinder/userfiles/files/7751023251.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e9ac12f12f34fdb97e036f4b2547b1e8/38127249214.pdfIn PDF document text
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17dcc7fe0---zenun.pdfIn PDF document text
- http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609056e013303---10806330664.pdfIn PDF document text
- https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2usqfftee0d6r4fcs7pgi9g535/59002465699.pdfIn PDF document text
- https://ichibaninfotech.com/ckfinder/userfiles/files/1450644450.pdfIn PDF document text
- http://alkanboya.com/files/file///powisipupofemolonomiwupe.pdfIn PDF document text
- http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e5d9bdb4ffd520e0d8bdf2eb95a9bb60/21838258988.pdfIn PDF document text
- http://lyzebrno.cz/userfiles/file/44966488258.pdfIn PDF document text
- http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vm3rgma4sk501e78taq79s4r80/9114577271.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/6619ad986bcf164fd5b6c3c702ca2b84/24212281215.pdfIn PDF document text
- http://midel.me/userfiles/file/sikememepumolaze.pdfIn PDF document text
- http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7712e7910c---18906959502.pdfIn PDF document text
- https://santchavarabed.in/ckfinder/userfiles/files/54467491231.pdfIn PDF document text
- http://bptramptour.pl/files/file/82166878223.pdfIn PDF document text
- http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/61605025277.pdfIn PDF document text
- http://studiomarazzi.eu/userfiles/files/xebilibejasisodamunogejad.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55406ccac---80607345521.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ac51effcf---relotedetedibedawotoveka.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5b03c5b1---96027044756.pdfIn PDF document text
- https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/1ec0e8bb05035d256e9f51b73384a604/nukevumodemosa.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_off0000fc92.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC92	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000114a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114A9	11308 bytes
SHA-256: `863ea034be023c55376b7baf662a21bec85bb80a7b6fc46971e75ff98fda71c4`
`font_02_sfnt_off00012ea1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12EA1	16836 bytes
SHA-256: `d1022a8ff15fbcc9205c41b48621253b4608d77e50635ca9eb35e0357b93811e`

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