Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd50d42c6cb82d6…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 03:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3dd6a0b6bdf0a624ef65f644fe2760ee SHA-1: 9917218dacb4591998a524ad6a583295ed22a267 SHA-256: 1dd50d42c6cb82d6639aec5d8877cd435e0480f74f6abebd7d5a9509225494e9
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=crack+hill+climb+racing PDF link annotation
    • https://tdfstore.it/file/felab.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/1055678747.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43107353588.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tahc01vt65rpheco7cd29377r5/zejixafesejamiradafof.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/barukiwunesaduke.pdfIn PDF document text
    • https://5udua.com/contents/files/79844607410.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/38777450008.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/pivilakusivabirur.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/wivivakogaxura.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/bizug.pdfIn PDF document text
    • http://chipgene.com/image/files/20210913_005641.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/juboledinunatu.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/49228768587.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d9dd8ca9---tulisijetegavepupuxopojam.pdfIn PDF document text
    • http://ausafe.net/images/art/files/zaripunan.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/nibuk.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/mesozipixugu.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/rirobisezuwexaginurejo.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/26172139798.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/680ac7f06cd079a338ffffc376beb4cb/fokatudif.pdfIn PDF document text
    • http://lscapital.it/images/file/52614893810.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161405ea57bbbb---17019176688.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/51158933588.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/82912697634.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.

FilenameKindSourceSize
font_00_sfnt_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 18280 bytes
SHA-256: 77187953514d280c68a473d49d33d8f3b4f824e669e9a7f1dc207983c84c6103
font_01_sfnt_off0001142e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 10424 bytes
SHA-256: 9435ff4ebd3951d4ad597dc54aa824d9878592c10fc4cc55d48276e62f68ee20
font_02_sfnt_off00012b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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