Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b7523c00f4f34f…

MALICIOUS

PDF

95.2 KB Created: 2021-08-15 13:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df4a7011f9e91f34980e8ff8032a76b7 SHA-1: 1f91be7ced63cd7d17672b6a144bce1343dec1d6 SHA-256: 12b7523c00f4f34fe2dba90ecc8ffb7bec009f600d6a0308f7ab1542ac1b72a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further stages of infection or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2478cb202---86968928151.pdf In PDF document text
    • http://augsburger-dartliga.de/uploads/file/xorenodov.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/84d93a73f45796afd0e07eacd9e5eaa5/vosibokisejulub.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210714_A021FFE8537D6BF6.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/59582701617.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b61fa4ee8b---93777709918.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60D4A9C28A205.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac61c608a8c---remerisa.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db696321914---7490200862.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/2774283653.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/budirise.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/62412106446.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zuravuzagupitijawun.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/76232809740.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c9746138adc6e2f99eec921fd712b099/losoxobuxujux.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uc5vk94o996f1d2u53j7gn6arm/37946385271.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/zamaxosivupuzaj.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/lozopadaranub.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/rivisapuselurunudi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1cd0a54486c361b2459b233b40b03668/61197245376.pdfIn PDF document text
    • https://anfauglir.com/images/file/zutafuniduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=reading+comprehension+for+esl+students+pdfPDF link annotation
    • 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.

FilenameKindSourceSize
font_00_sfnt_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 11212 bytes
SHA-256: b8049826762394031b2a0bfbd283fb2854aabfb95a2cf2fa614fe7a4eb5020b4
font_02_sfnt_off000140d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D9 17744 bytes
SHA-256: 404ed5ee835e0c3953d1bd41a93c4ea549088bbcb942d37d84d3dbba22b1c085

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