PDF malware analysis — malicious · 559322d705c2b5d2

MALICIOUS

PDF

112.0 KB Created: 2021-07-31 01:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 1d621f8569e8ba26912f58904702245b SHA-1: d97ad6eac21b83d5e7c33a07214ef69633887d5f SHA-256: 559322d705c2b5d241152b54d1884fe2d84d0529479de0b51c656d7e1cc457c7

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics (compromised CMS upload links, link farm) strongly suggest this PDF is used as a lure, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is the delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 0.9842

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 https://wastran.ru/uplcv?utm_term=radio+javan+app+pc+%D8%AF%D8%A7%D9%86%D9%84%D9%88%D8%AF PDF link annotation
- http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608832d9685ec---surepenatixerewevativ.pdfIn PDF document text
- http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3b83ea8f---kavegezobiwidi.pdfIn PDF document text
- https://songhong.info/userfiles/file/raveku.pdfIn PDF document text
- http://fxmeat.com/upload/file/cc18b42650bfbf389e86930bdd8dee26.pdfIn PDF document text
- http://sapientgenerator.ru/files/userfiles/files/32187927522.pdfIn PDF document text
- http://vce34.ru/attachments/file/renajon.pdfIn PDF document text
- https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b36d8d3f960718ce513fef7af5ab87e1/8543632267.pdfIn PDF document text
- https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6059e738e---19411808157.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/383b8658ac645ce6a4e9d22300db6839/64298876034.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3339e4009---55779659475.pdfIn PDF document text
- http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607047c70542e---worefo.pdfIn PDF document text
- http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18aa6d4aee---rubumuxuvi.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b5301c82a---tenivijoraxomitezefo.pdfIn PDF document text
- https://otartufo.com/ckfinder/tartufofiles/files/7273669428.pdfIn PDF document text
- http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b69703750fb---mibalumabumadugovexo.pdfIn PDF document text
- https://leganordavigliana.it/uploads/file/75580786601.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ade0a8d6fd---81271948707.pdfIn PDF document text
- http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba5babdaa---65120590108.pdfIn PDF document text
- http://np-laser.com/upload_fck/file/2021-6-19/20210619171250410620.pdfIn PDF document text
- https://akapacha.com/userfiles/file/5800422849.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897b497610c---90041641993.pdfIn PDF document text
- https://cahayaapi1.com/contents//files/natigoworubujotojusapi.pdfIn PDF document text
- https://aronabritcan.com/userfiles/file/pasesijenevido.pdfIn PDF document text
- http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/b2qfgfk0s9vstllod84c5bjjd2/909095984.pdfIn PDF document text
- https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/880a9c94a80ff7b68adfabaf43d58205/sujenugiwifa.pdfIn PDF document text
- http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/oifp80jj7t1ojqatb9d56nkh50/kogov.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_007_off000178c2.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x178C2	29684 bytes
SHA-256: `71d38f7b1c971e93a84dbd6e2198172fb2338ad4a16f3435c6e4988d947921c8`
`font_00_sfnt_off00011b98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B98	10204 bytes
SHA-256: `dccd3e0d642a86413a5e1b892287009345a5567a096241e005ef496c36690031`
`font_01_sfnt_off0001327e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1327E	16932 bytes
SHA-256: `c0098ff09b175ad8730ab6862323e25c4fa6589cb20e79ab6d8beb832d22e51b`
`font_02_sfnt_off00015f0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15F0F	17208 bytes
SHA-256: `6be1ed53ed35952afa8cf363273ef0e21d7253fd42250511edb339f001295c9a`

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