PDF malware analysis — malicious · f98cab9d6f87b7e8

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 07:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 71c721049414027c1074447865a49e66 SHA-1: c3ff1703f6feb49682ed43b51f037ec2c927f801 SHA-256: f98cab9d6f87b7e862fa254c8760d646e4bf8ce5f8a042c21ed81a872645ee4f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, many pointing to PDF files hosted on compromised WordPress sites or other disposable domains. The presence of 'utm_term' in some URLs suggests a tracking mechanism, common in phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.7566

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://archism.ru/uplcv?utm_term=snaptube+apk+latest+download PDF link annotation
- https://ojazzdance.fr/userfiles/file/dixaxipeloxefalenojizabo.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c19f475c06a69db9bff0502ec140513d/tugajobaxokubifugepidavak.pdfIn PDF document text
- https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/0l35urabc0iiladi7eit117djo/punokinutepi.pdfIn PDF document text
- https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddf4f419e1---pesuranerijanebazi.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e8a9db7d7---wunafuvunude.pdfIn PDF document text
- http://rencontres-icare.org/userfiles/file/8315583687.pdfIn PDF document text
- http://abwbaltimore.com/uploads/files/85956148805.pdfIn PDF document text
- http://ingatlantv.tv/userfiles/files/kasazozapakemajixewe.pdfIn PDF document text
- http://eviljoy.com/UserFiles/File/neroponeja.pdfIn PDF document text
- https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/453c1a0250f945798ffb5d8e184afdbc/dujowafaxunigogirati.pdfIn PDF document text
- http://sushinamu.com/uploads/files/lafuzojab.pdfIn PDF document text
- http://villaroyalenews.com/userimages/84860945888.pdfIn PDF document text
- https://radekslodkiewicz.pl/files/file/sedavabi.pdfIn PDF document text
- http://yishiweb.com/upfiles/files/20210902_053625.pdfIn PDF document text
- https://tempegaring.com/contents/files/mulonulaxidexat.pdfIn PDF document text
- http://atlonnuri.org/UpLoadImage/editer/files/xedawefofu.pdfIn PDF document text
- http://glttek.com/userfiles/file/gosafupixelak.pdfIn PDF document text
- https://felixtrail.com/imagini_ws/45256836213.pdfIn PDF document text
- http://tainanrup.longi.tw/uploadfiles/files/20210917_122358_4863.pdfIn PDF document text
- http://ybshajiang.com/userfiles/file/2021-09-07/210907001743079539pbbvrrkpowns.pdfIn PDF document text
- http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142268151db7---41024026803.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a3e303aeb827f77e43cd04d27ed43804/66254819199.pdfIn 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_off0000d41e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD41E	17796 bytes
SHA-256: `aa792af03066c0459d72622a49f3ee6eb4104f4e61619e9e401f4f8009400124`
`font_01_sfnt_off00010212.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10212	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011a29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A29	10688 bytes
SHA-256: `64439cb04e000b2dda132cb96d71a6739057f01053e2cff7446275eab878285a`

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